Taxes - Constituents of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 10,624	$ 78,152	$ 14,459
State	(879)	2,687	(617)
Foreign	6,307	7,624	7,309
Current income tax expense (benefit), Total	16,052	88,463	21,151
Deferred:
Federal	(1,271)	1,569	(3,031)
State	554	(639)	1,066
Foreign	(28)	359	(1,058)
Deferred income tax expense (benefit), Total	(745)	1,289	(3,023)
Income tax expense (benefit), continuing operations, Total	$ 15,307	$ 89,752	$ 18,128