Long-Term Debt - 2011 Senior Credit Facility (Details) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 15, 2013	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 11, 2011
Debt Instrument [Line Items]
Early repayment of senior debt				$ 0	$ 0	$ 315,743,000
Rate less than percent difference between debt instruments				10.00%
Loss on extinguishment of debt		$ 17,911,000	$ 17,911,000	$ 17,911,000	$ (493,000)	$ (750,000)
Line of Credit [Member] | 2011 Senior Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity							$ 350,000,000
Early repayment of senior debt	$ 315,743,000
Interest paid	807,000
Letter of credit and commitment fees	67,000
Total cash paid in connection with early repayment of debt	316,617,000
Loss on extinguishment of debt	$ 750,000
Secured Debt [Member] | 2011 Term Loan Facility [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity							300,000,000
Revolving Credit Facility [Member] | 2011 Revolving Loan Facility [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity							$ 50,000,000