Income Taxes (Income Tax Components) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 38,103	$ 31,295	$ 28,581
State	6,685	5,837	5,060
Foreign	2,672	2,048	2,181
Total Current	47,460	39,180	35,822
Deferred:
Federal & State	13,169	11,520	15,991
Foreign	(426)	(209)	(256)
Total Deferred	12,743	11,311	15,735
Total	$ 60,203	$ 50,491	$ 51,557