Income Taxes - Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at beginning of period	$ 344	$ 1,192	$ 1,234
Gross increases to current period tax positions	161	0	59
Gross increases (decreases) to prior period tax positions	(90)	(848)	(101)
Unrecognized tax benefits at end of period	$ 415	$ 344	$ 1,192