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Financial Instruments and Fair Values - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap agreements liability $ 5,234,000   $ 5,591,000
Unrealized gain (loss) on valuation of interest rate swap agreements 1,394,000 $ (19,371,000)  
Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap agreements liability 3,700,000    
Designated as Hedging Instrument | Cash Flow Hedging      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unrealized gain (loss) on valuation of interest rate swap agreements 1,400,000 $ (19,400,000)  
Amount expected to be reclassified within twelve months 1,300,000    
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Notional amount 970,000,000    
Prepaid expenses and other assets | 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 asset 1,500,000   600,000
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 $ 5,200,000   $ 5,600,000