Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary of net deferred tax asset (liability)
Current deferred tax assets	$ 9,060	$ 4,114
Deferred Tax Liabilities, Net, Noncurrent	99,212	53,466
Non-current deferred tax assets	4,358	11,224
Non-current deferred tax liability	(103,570)	(64,690)
Non-current deferred tax liability, net	(99,212)	(53,466)
Net deferred tax liability	$ (90,152)	$ (49,352)