Goodwill and Intangible Assets - Goodwill and Intangibles, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets, Net
Accumulated Amortization	$ (104,643)	$ (96,369)
Intangible Assets, Net (Excluding Goodwill)
Gross Carrying Value	471,760	471,760
Accumulated Amortization	(104,643)	(96,369)
Intangible assets, net	367,117	375,391
Trade names
Finite-Lived Intangible Assets, Net
Gross Carrying Value (finite life)	2,130	2,130
Accumulated Amortization	(1,357)	(1,167)
Intangible Assets, Net (finite life)	773	963
Intangible Assets, Net (Excluding Goodwill)
Accumulated Amortization	(1,357)	(1,167)
Customer relationships
Finite-Lived Intangible Assets, Net
Gross Carrying Value (finite life)	235,300	235,300
Accumulated Amortization	(88,396)	(82,010)
Intangible Assets, Net (finite life)	146,904	153,290
Intangible Assets, Net (Excluding Goodwill)
Accumulated Amortization	(88,396)	(82,010)
Proprietary technology
Finite-Lived Intangible Assets, Net
Gross Carrying Value (finite life)	32,240	32,240
Accumulated Amortization	(13,247)	(11,645)
Intangible Assets, Net (finite life)	18,993	20,595
Intangible Assets, Net (Excluding Goodwill)
Accumulated Amortization	(13,247)	(11,645)
Other
Finite-Lived Intangible Assets, Net
Gross Carrying Value (finite life)	2,090	2,090
Accumulated Amortization	(1,643)	(1,547)
Intangible Assets, Net (finite life)	447	543
Intangible Assets, Net (Excluding Goodwill)
Accumulated Amortization	(1,643)	(1,547)
Trade names
Indefinite-Lived Intangible Assets (Excluding Goodwill)
Indefinite-lived intangible assets	$ 200,000	$ 200,000