Intangible Assets and Goodwill Changes carrying amount of goodwill (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2017	Dec. 31, 2015	Nov. 11, 2013
Intangible Assets and Goodwill [Abstract]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 6,000,000	$ 20,000,000		$ 8,000,000	$ 6,000,000	$ 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	98,686,000	4,815,000
Goodwill, Acquired During Period		1,526,000	93,871,000
Goodwill, Ending Balance		100,212,000	98,686,000	4,815,000
Cash Acquired from Acquisition			(20,000,000)
Payments to Acquire Businesses, Net of Cash Acquired	3,000,000	3,011,000	110,900,000	0
Goodwill, Impairment Loss		$ 0	$ 0	$ 0