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Significant Accounting Policies (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Tax Assets, Net of Valuation Allowance, Current     $ 0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ 10,993 $ 8,845 9,321
Deferred Tax Liabilities, Net, Noncurrent 22,632 17,901 21,464
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 10,685 9,789  
Number of operating segments | segment 3    
Number of Reportable Segments | segment 1    
Scenario, Adjustment [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent   16,560  
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   (2,450)  
Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Tax Assets, Net of Valuation Allowance, Current   7,056  
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent   24,957  
Deferred Tax Liabilities, Net, Noncurrent   17,901  
Adjustments for New Accounting Pronouncement [Member] | Scenario, Adjustment [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   0  
Senior Unsecured Notes [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Finance Costs, Net $ 3,963 4,591 4,126
Other Noncurrent Assets [Member] | Adjustments for New Accounting Pronouncement [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Finance Costs, Net $ 3,963 $ 4,591 $ 4,126