Debt - Summary of Amendment to Senior Secured Revolving Credit Facility (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Debt Disclosure [Abstract]
Facility amount	$ 115,000,000
Interest rate applicable margin	200-300 basis points, based on leverage ratio
Unused fee	25 basis points if less than 50% unused, 35 basis points if more than 50% unused
Minimum fixed charge coverage ratio	1.50%