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CORPORATE BORROWINGS AND CAPITAL AND FINANCING LEASE OBLIGATIONS - Senior Secured Credit Facility (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 11, 2015
USD ($)
Dec. 10, 2015
Apr. 30, 2013
USD ($)
Dec. 31, 2015
USD ($)
item
Dec. 31, 2013
USD ($)
Senior Secured Credit Facility            
Corporate borrowings and capital and financing lease obligations            
Maximum borrowing capacity       $ 925,000,000    
Redemption price of debt instrument (as a percent)       100.00%    
Gains (Losses) on Extinguishment of Debt           $ 130,000
Stay of enforcement period         60 days  
Maximum senior secured leverage ratio 3.25       3.25  
Principal amount of guarantor or any significant subsidiary considered for defaults under other indebtedness, minimum         $ 25,000,000  
Number of uninsured judgments against the entity, any guarantor, or any significant subsidiary for specified principal amount considered as events of default, minimum | item         1  
Principal amount for which uninsured judgements against the entity, any guarantor, or any significant subsidiary considered as events of default         $ 25,000,000  
Senior Secured Credit Facility | First Amendment            
Corporate borrowings and capital and financing lease obligations            
Gains (Losses) on Extinguishment of Debt         1,366,000  
Senior Secured Credit Facility | Letter of credit            
Corporate borrowings and capital and financing lease obligations            
Available borrowing capacity $ 62,059,000       62,059,000  
Senior Secured Credit Facility | Base rate            
Corporate borrowings and capital and financing lease obligations            
Variable rate basis       Base rate    
Senior Secured Credit Facility | Base rate | First Amendment            
Corporate borrowings and capital and financing lease obligations            
Reference rate (as a percent)   2.25%        
Senior Secured Credit Facility | LIBOR            
Corporate borrowings and capital and financing lease obligations            
Variable rate basis       LIBOR    
Reference rate (as a percent)       0.75%    
Senior Secured Credit Facility | LIBOR | First Amendment            
Corporate borrowings and capital and financing lease obligations            
Reference rate (as a percent)   3.25%        
Revolving credit facility due in 2018            
Corporate borrowings and capital and financing lease obligations            
Maximum borrowing capacity       $ 150,000,000    
Capitalized deferred financing costs       6,909,000    
Term loans due 2016            
Corporate borrowings and capital and financing lease obligations            
Outstanding aggregate principal balance       760,338,000    
Credit Facility term loans due in 2020            
Corporate borrowings and capital and financing lease obligations            
Maximum borrowing capacity       775,000,000    
Capitalized deferred financing costs       $ 2,217,000    
Required quarterly repayments of principal (as a percent)       0.25%    
Principal repayments per quarter       $ 1,937,500    
Discount percentage on issuance of term loan       0.25%    
Senior Secured Credit Facility Term-Loan Due 2022 (3.5% as of December 31, 2015)            
Corporate borrowings and capital and financing lease obligations            
Aggregate principal amount $ 880,625,000       $ 880,625,000  
Interest rate for borrowings (as a percent) 4.00%       4.00%  
Spread on variable rate basis (as a percent)     2.75%      
Required quarterly repayments of principal (as a percent) 0.25%       0.25%  
Principal repayments per quarter         $ 2,201,500  
Unused commitment fee (as a percent)         0.50%  
Fee on undrawn amount of the letter of credit (as a percent)         0.25%  
Senior Secured Credit Facility Term-Loan Due 2022 (3.5% as of December 31, 2015) | First Amendment            
Corporate borrowings and capital and financing lease obligations            
Aggregate principal amount   $ 125,000,000        
Capitalized deferred financing costs   3,329,000        
Senior Secured Credit Facility Term-Loan Due 2022 (3.5% as of December 31, 2015) | Base rate            
Corporate borrowings and capital and financing lease obligations            
Spread on variable rate basis (as a percent)         2.25%  
Reference rate (as a percent)         1.75%  
Senior Secured Credit Facility Term-Loan Due 2022 (3.5% as of December 31, 2015) | Base rate | Minimum            
Corporate borrowings and capital and financing lease obligations            
Spread on variable rate basis (as a percent)         1.25%  
Senior Secured Credit Facility Term-Loan Due 2022 (3.5% as of December 31, 2015) | Base rate | Maximum            
Corporate borrowings and capital and financing lease obligations            
Spread on variable rate basis (as a percent)         1.50%  
Senior Secured Credit Facility Term-Loan Due 2022 (3.5% as of December 31, 2015) | LIBOR            
Corporate borrowings and capital and financing lease obligations            
Spread on variable rate basis (as a percent) 3.25%       3.25%  
Senior Secured Credit Facility Term-Loan Due 2022 (3.5% as of December 31, 2015) | LIBOR | Minimum            
Corporate borrowings and capital and financing lease obligations            
Spread on variable rate basis (as a percent)     0.75%   2.25%  
Reference rate (as a percent) 0.75%          
Senior Secured Credit Facility Term-Loan Due 2022 (3.5% as of December 31, 2015) | LIBOR | Maximum            
Corporate borrowings and capital and financing lease obligations            
Spread on variable rate basis (as a percent)         2.50%  
Senior Secured Credit Facility-Revolving Credit Facility Due 2020 (2.8445% as of December 31, 2015)            
Corporate borrowings and capital and financing lease obligations            
Aggregate principal amount $ 75,000,000       $ 75,000,000  
Interest rate for borrowings (as a percent) 2.8445%       2.8445%  
Senior Secured Credit Facility-Revolving Credit Facility Due 2020 (2.8445% as of December 31, 2015) | First Amendment            
Corporate borrowings and capital and financing lease obligations            
Capitalized deferred financing costs   $ 6,545,000