Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other intangible assets
Gross carrying amount	$ 77,896	$ 37,106
Accumulated amortization	(17,988)	(11,907)
Net carrying amount	59,908	25,199
Amortization expense	6,081	2,172	1,991
Estimated amortization expense for other intangibles for each of the next five years
2014	8,763
2015	8,287
2016	6,727
2017	6,440
2018	6,055
Thereafter	23,636
Total estimated amortization expense for other intangibles for the next five years	$ 59,908
Minimum
Other intangible assets
Estimated useful lives	2 years
Maximum
Other intangible assets
Estimated useful lives	15 years