Income Taxes (Income Tax Components) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 33,623	$ 38,103	$ 31,295
State	7,717	6,685	5,837
Foreign	2,725	2,672	2,048
Total Current	44,065	47,460	39,180
Deferred:
Federal & State	(4,726)	13,169	11,520
Foreign	(120)	(426)	(209)
Total Deferred	(4,846)	12,743	11,311
Total	$ 39,219	$ 60,203	$ 50,491