Other Intangible Assets - Additional Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Finite and Indefinite Lived Intangible Assets [Line Items]
Amortization of finite-lived intangible assets	$ 700	$ 700	$ 2,000	$ 2,000
Amortization of deferred financing costs	$ 100	$ 100	$ 294	$ 376
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