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Debt (Senior Notes) (Details) - USD ($)
$ in Thousands
Apr. 05, 2017
Jul. 23, 2014
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Debt issuance costs, net     $ 6,115 $ 6,983
Term Loan [Member]        
Debt Instrument [Line Items]        
Debt issuance costs, net     3,700  
Unsecured Credit Facility [Member] | Term Loan [Member]        
Debt Instrument [Line Items]        
Unsecured term loan outstanding   $ 75,000    
Senior Notes [Member]        
Debt Instrument [Line Items]        
Aggregate principal amount   $ 300,000    
Interest rate   5.875%    
Senior notes due   2022    
Maturity date   Aug. 01, 2022    
Debt discount recorded     1,600  
Debt issuance costs, net     $ 5,500  
Percentage of issued price equal to face value   99.211%    
Interest Rate Swap        
Debt Instrument [Line Items]        
Derivative instruments, notional amount $ 400,000      
Weighted average effective fixed interest rate 3.50%      
Interest Rate Swap | Term Loan [Member]        
Debt Instrument [Line Items]        
Aggregate principal amount $ 400,000      
Interest Rate Swap | Term Loan Maturing December 17,2021 [Member]        
Debt Instrument [Line Items]        
Derivative instruments, notional amount 200,000      
Interest Rate Swap | Term Loan Maturing April 27, 2022 [Member]        
Debt Instrument [Line Items]        
Derivative instruments, notional amount $ 200,000      
LIBOR [Member] | Interest Rate Swap        
Debt Instrument [Line Items]        
Variable rate basis LIBOR      
Spread 1.50%