Intangible Assets and Goodwill Changes carrying amount of goodwill (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 11, 2013
Intangible Assets and Goodwill [Abstract]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 20,000,000			$ 20,000,000
amount recorded for unsettled working capital adjustment					$ 1,500,000
change in estimate financial impact, per share, net of tax				$ 0.02
Goodwill, Beginning balance	$ 98,686,000	100,212,000	$ 98,686,000
Goodwill, Acquired During Period		0	1,526,000
Goodwill, Ending Balance		100,212,000	100,212,000	98,686,000
Cash Acquired from Acquisition				(20,000,000)
Payments to Acquire Businesses, Net of Cash Acquired	$ 3,000,000	$ 0	3,011,000	110,900,000
Goodwill, Impairment Loss			$ 0	$ 0