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Discontinued Operations Discontinued Operations (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, cash received									$ 12,500,000
Disposal Group, Including Discontinued Operation, Revenue									2,462,000	18,534,000	16,925,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									346,000	2,841,000	2,285,000
Discontinued Operation, Tax Effect of Discontinued Operation									133,000	980,000	802,000
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax									213,000	1,861,000	1,483,000
Pre-tax gain on sale of ASMP									1,877,000	0	0
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation									398,000	0	0
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax									1,479,000	0	0
Discontinued Operation, Amount of Other Income (Loss) from Disposition of Discontinued Operation, Net of Tax									1,692,000	1,861,000	1,483,000
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share	$ 0.03	$ 0.00	$ 0.00	$ 0.16	$ 0.08	$ 0.05	$ 0.05	$ 0.05	$ 0.20	$ 0.22	$ 0.18
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share									$ 0.20	$ 0.22	$ 0.18
ASMP [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									346,000	2,801,000	2,118,000
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share									$ 0.20	$ 0.21	$ 0.15
Other discontinued operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									$ 0	$ 40,000	$ 167,000
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share									$ 0.00	$ 0.01	$ 0.03