Quarterly report pursuant to Section 13 or 15(d)

DEBT FINANCING - Narrative (Details)

v3.7.0.1
DEBT FINANCING - Narrative (Details) - USD ($)
Feb. 08, 2017
Jun. 30, 2017
Credit Facility [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 1,000,000,000  
Unsecured Debt [Member] | Amended Credit Facility [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity 895,000,000  
Increase in credit facility 170,000,000.0  
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche A Term Loan [Member]    
Debt Instrument [Line Items]    
Increase to maximum borrowing capacity 10,000,000  
Maximum borrowing capacity 235,000,000  
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche B Term Loan [Member]    
Debt Instrument [Line Items]    
Increase to maximum borrowing capacity 55,000,000  
Maximum borrowing capacity 155,000,000  
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 105,000,000  
Debt instrument, prepayment premium, first term, rate 2.00%  
Debt instrument, prepayment premium, second term, rate 1.00%  
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Federal Funds Effective Swap Rate [Member]    
Debt Instrument [Line Items]    
Borrowing rate spread 0.50%  
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Borrowing rate spread 1.00%  
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Minimum [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Leverage based margin threshold 1.70%  
Elective leverage based margin threshold 1.50%  
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Minimum [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Leverage based margin threshold 0.70%  
Elective leverage based margin threshold 0.50%  
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Maximum [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Leverage based margin threshold 2.25%  
Elective leverage based margin threshold 2.45%  
Unsecured Debt [Member] | Amended Credit Facility [Member] | Tranche C Term Loan [Member] | Maximum [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Leverage based margin threshold 1.25%  
Elective leverage based margin threshold 1.45%  
Line of Credit [Member] | Amended Credit Facility [Member] | Revolving line of credit [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 400,000,000  
Line of Credit [Member] | Credit Facility [Member] | Revolving line of credit [Member]    
Debt Instrument [Line Items]    
Remaining borrowing capacity   $ 214,300,000
Line of Credit [Member] | Credit Facility [Member] | Letter of Credit [Member]    
Debt Instrument [Line Items]    
Outstanding letters of credit   $ 4,700,000