Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 1,266
Amount of loss on derivative instruments recognized in income	(3)	$ (3)
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ (1,515)	(3,746)
Derivative, lower fixed interest rate (percentage)	1.77%
Estimated gain (loss) expected to be reclassified from accumulated other comprehensive income to income	$ (4,900)
Derivative liability, termination value	$ 8,700
LIBOR [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative instrument, term for variable interest rate	1 month
Minimum [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, variable interest rate	1.00%
Interest Expense [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (1,266)	(3,097)
Gain (Loss) on Derivative Instruments [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Amount of Gain (Loss) on Derivatives Recognized in Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)	(3)	$ (3)
Designated as Hedging Instrument [Member] | Interest rate swaps and other long-term liabilities, net [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value	8,100		$ 8,300
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Amount of Hedged Item	$ 916,800
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Fixed Interest Rate [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Effective fixed interest rate on hedged variable interest rate debt	5.02%