Income Taxes (Components of Income Tax Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 442	$ 3,944	$ 19,150
State	(85)	390	(13)
Foreign	(526)	1,841	242
Total current	(169)	6,175	19,379
Deferred:
Federal	1,564	(2,628)	(984)
State	(112)	(63)	(1,147)
Foreign	(46)	(8)	0
Total deferred	1,406	(2,699)	(2,131)
Income tax expense	$ 1,237	$ 3,476	$ 17,248