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Significant Accounting Policies (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Accounting Policies [Abstract]          
Number of operating segments | segment     3    
Number of reportable segments | segment     1    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Increase non-current deferred tax assets $ 10,720,000 $ 8,687,000 $ 10,720,000 $ 8,687,000 $ 9,321,000
Increase in non-current deferred tax liabilities 23,800,000 18,322,000 23,800,000 18,322,000 21,464,000
Reduction in comprehensive income (2,541,000) 6,682,000 8,144,000 16,471,000  
Scenario, Adjustment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Increase non-current deferred tax assets   18,890,000   18,890,000  
Reduction in comprehensive income   (2,330,000)   (4,780,000)  
Adjustments for New Accounting Pronouncement [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Decrease in current deferred tax assets   7,009,000   7,009,000  
Increase non-current deferred tax assets   25,331,000   25,331,000  
Increase in non-current deferred tax liabilities   18,322,000   18,322,000  
Adjustments for New Accounting Pronouncement [Member] | Other Noncurrent Assets [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred finance costs, net (3,797,000) (4,436,000) (3,797,000) (4,436,000) (4,126,000)
Adjustments for New Accounting Pronouncement [Member] | Senior Unsecured Notes [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Deferred finance costs, net $ 3,797,000 4,436,000 $ 3,797,000 4,436,000 $ 4,126,000
Adjustments for New Accounting Pronouncement [Member] | Scenario, Adjustment [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reduction in comprehensive income   $ 0   $ 0