Income Taxes - Current and Deferred Tax (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Document Fiscal Year Focus	2013
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	34.00%
Current	$ 0	$ 97	$ 283
Deferred	0	13,727	2,422
Total income tax expense (benefit)	$ 0	$ 13,824	$ 2,705