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Derivative Instruments (Details) - USD ($)
Oct. 03, 2016
Sep. 30, 2016
Dec. 31, 2015
Apr. 30, 2015
Subsequent Event [Member] | Senior Notes [Member] | 5.125% Senior Notes Due 2024 [Member]        
Derivative [Line Items]        
Aggregate principal amount $ 325,000,000      
Interest rate 5.125%      
Subsequent Event [Member] | Line of Credit [Member]        
Derivative [Line Items]        
Debt repayments $ 138,438,000      
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Interest rate swap, face amount       $ 100,000,000
Fixed rate on interest rate swap, percent       0.983%
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Subsequent Event [Member]        
Derivative [Line Items]        
Interest rate swap, face amount $ 40,000,000      
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Long-time Liabilities [Member]        
Derivative [Line Items]        
Fair value of interest rate swap liability   $ (396,000)    
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]        
Derivative [Line Items]        
Fair value of interest rate swap asset     $ 165,000