Other Intangible Assets - Additional Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Amortization of finite-lived intangible assets	$ 700	$ 700
Amortization of deferred financing costs	$ 96	$ 130
Minimum
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Amortization period	2 years
Maximum
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Amortization period	20 years