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Financial Instruments and Fair Values - Narrative (Details)
 3 Months Ended
Mar. 31, 2016
USD ($)
derivative
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap agreements liability $ 21,294,000   $ 1,922,000
Unrealized loss on valuation of interest rate swap agreements 19,371,000 $ 0  
Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap agreements liability 22,300,000    
Designated as Hedging Instrument | Cash Flow Hedging      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized loss on valuation of interest rate swap agreements 19,400,000    
Gain (loss) expected to be reclassified within twelve months $ 0    
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative, number of instruments held (derivative) | derivative 3    
Notional amount $ 465,000,000    
Accounts payable and accrued expenses | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap agreements liability $ 21,300,000