Derivative Financial Instruments - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Objectives for using derivative instruments	The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps, including interest rate collars, as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.
Net derivative gain will be reclassified from AOCI into net income	$ 1,900,000
Fair value of derivatives in net asset position	4,700,000	$ 3,900,000
Posted collateral related to agreements	0	0
Foreign Currency Forward Contracts
Derivative [Line Items]
Fair value of foreign exchange hedges	0	0
Total notional amount of foreign exchange contracts	$ 122,400,000	$ 87,600,000