Derivative Instruments - Derivatives Designated as Hedging Instruments Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2011 USD ($) derivative_instrument
Derivatives, Fair Value [Line Items]
Gain or (loss) recognized in income, on the ineffective portion of derivative instruments	$ 0	$ 0
Cash flow hedge gain (loss) to be reclassified within twelve months	2,600
Interest rate swaps | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Derivative liability, current	$ 2,626		$ 5,218
Cash Flow Hedging | Interest rate swaps | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Number of interest rate derivatives held | derivative_instrument				2
Derivative, floor interest rate				1.25%
Cash Flow Hedging | Fixed Rate 2.61% Interest Rate Swap | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Derivative, notional amount				$ 450,000
Derivative, fixed interest rate				2.61%
Cash Flow Hedging | Fixed Interest 2.71% Interest Rate Swap | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Derivative, notional amount				$ 300,000
Derivative, fixed interest rate				2.71%