Derivative Financial Instruments - Summary of Fair Value of Interest Rate Related Derivative Financial Instruments and Their Classification on the Consolidated Balance Sheets (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Current Assets
Derivative [Line Items]
Fair value of derivative instruments, asset derivatives	$ 486
Other Assets
Derivative [Line Items]
Fair value of derivative instruments, asset derivatives	$ 3,398	$ 3,052
Other Liabilities
Derivative [Line Items]
Fair value of derivative instruments, liability derivatives		$ 735