Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Goodwill and other intangible assets
Goodwill, Gross	$ 10,465	$ 10,530
Goodwill, Net	10,465	10,530
Other intangible assets, Accumulated Amortization	(7,010)	(5,750)
Other intangible assets, Net	3,226
Total intangible assets, Gross	21,949	22,158
Total intangible assets, Net	14,939	16,408
Amortization relating to other intangible assets
2014	1,311
2015	1,030
2016	531
2017	354
Other intangible assets, Net	3,226
Technology, patents and trade names
Goodwill and other intangible assets
Other intangible assets, Gross	4,788	4,859
Other intangible assets, Accumulated Amortization	(3,167)	(2,825)
Other intangible assets, Net	1,621	2,034
Amortization relating to other intangible assets
Other intangible assets, Net	1,621	2,034
Customer relationships and non-compete agreements
Goodwill and other intangible assets
Other intangible assets, Gross	4,676	4,749
Other intangible assets, Accumulated Amortization	(2,463)	(2,232)
Other intangible assets, Net	2,213	2,517
Amortization relating to other intangible assets
Other intangible assets, Net	2,213	2,517
Contract-based
Goodwill and other intangible assets
Other intangible assets, Gross	2,020	2,020
Other intangible assets, Accumulated Amortization	(1,380)	(693)
Other intangible assets, Net	640	1,327
Amortization relating to other intangible assets
Other intangible assets, Net	$ 640	$ 1,327