Goodwill and Other Intangible Assets - Identifiable Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Total other intangibles, gross	$ 36,581	$ 36,581
Less accumulated amortization	19,473	16,232
Other intangibles, net	17,108	20,349
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Total other intangibles, gross	35,781	35,781
Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Total other intangibles, gross	$ 800	$ 800