Derivative Financial Instruments Derivative Financial Instruments Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2012
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (229,327,000)	$ (200,607,000)
Long-term Debt	305,292,000
Secured Debt [Member]
Derivative [Line Items]
Long-term Debt	305,292,000	371,212,000
Accumulated Other Comprehensive Income, Net Unrealized Gain (Loss) on Nonderivative Instruments [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (14,380,000)	$ (14,380,000)	$ (14,380,000)	$ (14,380,000)
Number of Counterparties [Member]
Derivative [Line Items]
Description of Derivative Activity Volume	three	nine
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member]
Derivative [Line Items]
Long-term Debt	$ 248,100,000
Interest Rate Swap [Member]
Derivative [Line Items]
Number of Interest Rate Derivatives Held	1				6
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 900,000
Derivative, Notional Amount	$ 214,000,000				$ 200,000,000
Derivative, Fixed Interest Rate	1.42%				1.00%
Interest Rate Cap [Member]
Derivative [Line Items]
Number of Interest Rate Derivatives Held	3
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 200,000
Derivative, Cap Interest Rate	2.00%
Derivative, Notional Amount	$ 100,000,000
Derivative Purchase Price	$ 1,700,000
Interest Rate Cap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held	2
Forward Contracts [Member]
Derivative [Line Items]
Description of Derivative Activity Volume	49
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 120,000
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 42,300,000