Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Gross Carrying Amount	$ 101,963	$ 96,674
Weighted-Average Amortization Period (in years)	14 years	14 years
Accumulated Amortization	24,140	16,164
Net Carrying Amount	77,823	80,510
Intangibles not subject to amortization
Goodwill	128,725	128,725
Trademarks	15,455	15,455
Total goodwill and other intangible assets	222,003	224,690
Changes in goodwill
Goodwill, gross, balance at the beginning of the period	144,556	135,876
Additions through acquisitions, gross	0	8,680
Goodwill, gross, balance at the end of the period	144,556	144,556
Accumulated impairment, balance at the beginning of the period	(15,831)	(15,831)
Impairment loss	0	0
Accumulated impairment, balance at the end of the period	(15,831)	(15,831)
Goodwill, net, balance at the beginning of the period	128,725	120,045
Additions through acquisitions, Net	0	8,680
Goodwill, Impairment loss	0	0
Goodwill, net, balance at the end of the period	$ 128,725	$ 128,725