Summary of Significant Accounting Policies (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets
Gross carrying amount	$ 83,277	$ 73,467
Accumulated amortization	21,605	16,150
Technologies
Finite-Lived Intangible Assets
Gross carrying amount	47,157	47,157
Accumulated amortization	13,244	10,384
Non-compete agreements
Finite-Lived Intangible Assets
Gross carrying amount	2,022	1,932
Accumulated amortization	1,243	1,048
Licenses
Finite-Lived Intangible Assets
Gross carrying amount	650	650
Accumulated amortization	424	407
Customer lists
Finite-Lived Intangible Assets
Gross carrying amount	3,423	3,423
Accumulated amortization	1,053	679
Customer relationships
Finite-Lived Intangible Assets
Gross carrying amount	20,700	11,690
Accumulated amortization	3,575	2,218
Trade names
Finite-Lived Intangible Assets
Gross carrying amount	9,325	8,615
Accumulated amortization	$ 2,066	$ 1,414