Other Intangible Assets, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible assets, net
Intangible assets	$ 126,353	$ 126,353
Accumulated (amortization ) accretion	(35,325)	(20,181)
Intangible assets, net	91,028	106,222
Amortization expense	15,172	16,812	4,024
Weighted average useful life	13 years 6 months
Expected future amortization of intangible assets
2015	15,132
2016	14,564
2017	7,190
2018	5,301
2019	5,222
2020 and Thereafter	43,619
Intangible assets, net	91,028	106,222
Non-competition agreements
Intangible assets, net
Intangible assets	933	933
Accumulated (amortization ) accretion	(879)	(831)
Intangible assets, net	54	102
Weighted average useful life	3 years 6 months
Expected future amortization of intangible assets
Intangible assets, net	54	102
Trade name / trademarks
Intangible assets, net
Intangible assets	9,770	9,770
Accumulated (amortization ) accretion	(5,487)	(3,168)
Intangible assets, net	4,283	6,652
Weighted average useful life	4 years 4 months 24 days
Expected future amortization of intangible assets
Intangible assets, net	4,283	6,652
Existing technology
Intangible assets, net
Intangible assets	34,650	34,650
Accumulated (amortization ) accretion	(17,358)	(9,737)
Intangible assets, net	17,292	24,913
Weighted average useful life	9 years 10 months 24 days
Expected future amortization of intangible assets
Intangible assets, net	17,292	24,913
Management contracts
Intangible assets, net
Intangible assets	81,000	81,000
Accumulated (amortization ) accretion	(11,601)	(6,445)
Intangible assets, net	69,399	74,555
Weighted average useful life	16 years 2 months 12 days
Expected future amortization of intangible assets
Intangible assets, net	$ 69,399	$ 74,555
Minimum
Intangible assets, net
Weighted average useful life	1 year
Maximum
Intangible assets, net
Weighted average useful life	19 years