Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense for intangible assets	$ 5,780	$ 11,514	$ 11,176
Estimated future amortization expense, 2019	3,264
Estimated future amortization expense, 2020	2,721
Estimated future amortization expense, 2021	2,415
Estimated future amortization expense, 2022	2,148
Estimated future amortization expense, 2023	1,921
Estimated future amortization expense, thereafter	$ 12,960