Debt - Two Thousand Eleven Credit Facility - Additional Information (Details) - USD ($)			3 Months Ended		9 Months Ended
	Jun. 26, 2015	Dec. 20, 2011	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Borrowing capacity under Credit Facility		$ 600,000,000
Total interest and commitments fees			$ 3,000,000	$ 3,000,000	$ 10,000,000	$ 7,000,000
2011 Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity under Credit Facility		$ 200,000,000
Credit facility, expiration period		5 years
Credit facility, maturity date		Dec. 31, 2016
Term Loan
Debt Instrument [Line Items]
Term Loan Facility, principal amount		$ 400,000,000
Period of Term Loan Facility		5 years
Borrowings, maturity date		Dec. 31, 2016
Principal amount repaid	$ 290,000,000
Total interest and commitments fees						$ 3,000,000
Gain (Loss) on Extinguishment of Debt	$ 0