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Financial Instruments and Fair Values - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
derivative
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
derivative
Sep. 30, 2014
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2014
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest rate swap agreements liability $ 4,384   $ 4,384     $ 0
Unrealized loss on valuation of interest rate swap agreements (4,384) $ 0 (4,384) $ 0    
Interest Expense 16,680 $ 17,674 50,298 $ 46,640    
Interest Rate Swap            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest rate swap agreements liability 4,600   4,600      
Cash Flow Hedging | Designated as Hedging Instrument            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Unrealized loss on valuation of interest rate swap agreements 4,400          
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest rate swap agreements liability $ 4,400   $ 4,400      
Derivative, Number of Instruments Held | derivative 3   3      
Derivative, Notional Amount $ 465,000   $ 465,000      
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest rate swap agreements liability $ 4,400   $ 4,400      
Cash Flow Hedging | Designated as Hedging Instrument | Minimum | Interest Rate Swap            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fixed rate on derivate 2.1485%   2.1485%      
Cash Flow Hedging | Designated as Hedging Instrument | Maximum | Interest Rate Swap            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fixed rate on derivate 2.505%   2.505%      
Estimate | Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedging | Designated as Hedging Instrument            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Interest Expense         $ 0