Intangible Assets - Intangibles, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets, Net
Accumulated Amortization	$ (117,181)	$ (112,985)
Intangible Assets, Net (Excluding Goodwill)
Gross Carrying Value	475,450	475,450
Accumulated Amortization	(117,181)	(112,985)
Intangible assets, net	358,269	362,465
Trade names
Finite-Lived Intangible Assets, Net
Gross Carrying Value (finite life)	2,410	2,410
Accumulated Amortization	(1,582)	(1,509)
Intangible Assets, Net (finite life)	828	901
Intangible Assets, Net (Excluding Goodwill)
Accumulated Amortization	(1,582)	(1,509)
Customer relationships
Finite-Lived Intangible Assets, Net
Gross Carrying Value (finite life)	237,620	237,620
Accumulated Amortization	(98,097)	(94,851)
Intangible Assets, Net (finite life)	139,523	142,769
Intangible Assets, Net (Excluding Goodwill)
Accumulated Amortization	(98,097)	(94,851)
Proprietary technology
Finite-Lived Intangible Assets, Net
Gross Carrying Value (finite life)	32,240	32,240
Accumulated Amortization	(15,649)	(14,849)
Intangible Assets, Net (finite life)	16,591	17,391
Intangible Assets, Net (Excluding Goodwill)
Accumulated Amortization	(15,649)	(14,849)
Other
Finite-Lived Intangible Assets, Net
Gross Carrying Value (finite life)	3,180	3,180
Accumulated Amortization	(1,853)	(1,776)
Intangible Assets, Net (finite life)	1,327	1,404
Intangible Assets, Net (Excluding Goodwill)
Accumulated Amortization	(1,853)	(1,776)
Trade names
Indefinite-Lived Intangible Assets (Excluding Goodwill)
Indefinite-lived intangible assets	$ 200,000	$ 200,000