Discontinued Operations Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income and Gain from Sale of Discontinued Operations
Discontinued operations, cash received	$ 12,500
Disposal Group, Including Discontinued Operation, Revenue	0	$ 0	$ 2,462
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	0	0	346
Discontinued Operation, Tax Effect of Discontinued Operation	0	0	133
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	0	0	213
Pre-tax gain on sale of ASMP	0	0	(1,877)
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation	0	0	398
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	0	1,479
Income and gain from discontinued operations, net of tax	$ 0	$ 0	$ 1,692
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.00	$ 0.20