Derivative Financial Instruments - Interest Rate Swaps Designated as Hedging Instruments on the Consolidated Balance Sheets (Details) - Cash Flow Hedging - Interest Rate Swap - Designated as Hedging Instrument - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Interest rate swaps - current	$ 808	$ 461
Other long-term assets
Derivatives, Fair Value [Line Items]
Interest rate swaps - non-current	$ 1,600	$ 1,717