Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Other intangible assets
Gross carrying amount	$ 82,221	$ 82,221	$ 75,354	$ 75,354
Accumulated amortization	(32,239)	(32,239)	(26,115)	(24,063)
Net carrying amount	49,982	49,982	49,239	51,291
Amortization expense	2,100	6,100
Estimated amortization expense for other intangibles for each of the next five quarters
December 31, 2015	2,266	2,266
March 31, 2016	1,904	1,904
June 30, 2016	1,892	1,892
September 30, 2015	1,891	1,891
December 31, 2016	1,890	1,890
Thereafter	40,139	40,139
Net carrying amount	$ 49,982	$ 49,982	$ 49,239	$ 51,291
Minimum
Other intangible assets
Estimated useful lives		2 years
Maximum
Other intangible assets
Estimated useful lives		15 years