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Financial Instruments and Fair Values - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
derivative
Dec. 31, 2014
USD ($)
Derivative [Line Items]      
Interest rate swap agreements liability   $ 1,922,000 $ 0
Unrealized loss on valuation of interest rate swap agreements $ 0 (1,922,000) $ 0
Interest Rate Swap [Member]      
Derivative [Line Items]      
Interest rate swap agreements liability   2,000,000  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative [Line Items]      
Unrealized loss on valuation of interest rate swap agreements   1,900,000  
Gain (loss) expected to be reclassified within twelve months   0  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Swap [Member]      
Derivative [Line Items]      
Interest rate swap agreements liability   $ 1,900,000  
Number of instruments held (derivative) | derivative   3  
Notional amount   $ 465,000,000