Derivative Instruments - Schedule of Outstanding Interest Rate Derivatives Designated as Cash Flow Hedges of Interest Rate Risk (Details) - Interest rate cap - Cash flow hedging - Designated as hedging instrument $ in Thousands	Dec. 31, 2017 USD ($) financial_instrument	Mar. 04, 2016 USD ($)
Derivative [Line Items]
Number of Instruments | financial_instrument	1
Notional Amount | $	$ 400,000	$ 400,000