Goodwill and Other Intangible Assets - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Indefinite-lived Intangible Assets [Line Items]
Intangible assets amortization expense	$ 1,500	$ 1,500	$ 3,000	$ 3,000
Gross Carrying Amount	72,855		72,855		$ 71,455
Other intangible assets, net	34,033		34,033		$ 35,623
Licensing Agreements [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	1,400		1,400
Other intangible assets, net	$ 1,400		$ 1,400