Subsequent Events - Execution of Credit Agreement (Details) - Wells Fargo Bank, National Association - USD ($)		12 Months Ended
	Jan. 05, 2016	Dec. 31, 2015	Sep. 30, 2013	Sep. 25, 2013
Secured Credit Facility | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Revolving credit facility	$ 400,000,000
Secured Credit Facility | Credit Agreement, Interest Rate Option One | Minimum | London Interbank Offered Rate (LIBOR) | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate	1.50%
Secured Credit Facility | Credit Agreement, Interest Rate Option One | Maximum | London Interbank Offered Rate (LIBOR) | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate	2.25%
Secured Credit Facility | Credit Agreement, Interest Rate Option Two | Federal Funds Rate | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate	0.50%
Secured Credit Facility | Credit Agreement, Interest Rate Option Two | Minimum | London Interbank Offered Rate (LIBOR) | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate	0.50%
Secured Credit Facility | Credit Agreement, Interest Rate Option Two | Maximum | London Interbank Offered Rate (LIBOR) | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate	1.25%
Revolving Credit Facility | Line of Credit
Subsequent Event [Line Items]
Revolving credit facility				$ 75,000,000
Revolving Credit Facility | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Revolving credit facility	$ 200,000,000
Credit agreement term	5 years
Amount borrowed	$ 55,000,000
Revolving Credit Facility | Minimum | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Commitment fee percentage	0.20%
Revolving Credit Facility | Maximum | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Commitment fee percentage	0.35%
Term Loan Facility | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Revolving credit facility	$ 200,000,000
Credit agreement term	5 years
Amount borrowed	$ 200,000,000
Loan amortization during first two years	5.00%
Loan amortization during third and fourth years	10.00%
Loan amortization during fifth year	15.00%
Letter of Credit | Subsequent Event
Subsequent Event [Line Items]
Revolving credit facility	$ 10,000,000
Letter of Credit | Line of Credit
Subsequent Event [Line Items]
Revolving credit facility			$ 10,000,000
Commitment fee percentage		0.25%
Letter of Credit | London Interbank Offered Rate (LIBOR) | Line of Credit
Subsequent Event [Line Items]
Debt instrument basis spread on variable rate		1.75%
Letter of Credit | Minimum | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Credit participation fee	1.50%
Letter of Credit | Maximum | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Credit participation fee	2.25%
Swing Line Loan | Subsequent Event
Subsequent Event [Line Items]
Revolving credit facility	$ 10,000,000