Recent Accounting Pronouncements - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 268,994		$ 271,023
Other comprehensive income, net of tax		$ (104)	$ 230
Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other comprehensive income, net of tax	$ 147