Debt (Details) (Revolving Credit Facility [Member], USD $)	0 Months Ended
	Oct. 15, 2013	Mar. 31, 2014	Oct. 16, 2013
Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity			$ 300,000,000
Line of Credit Facility, Difference Between Current Borrowing Capacity and Maximum Borrowing Capacity			200,000,000
Line of Credit Facility, Maximum Borrowing Capacity			500,000,000
Debt Instrument, Description of Variable Rate Basis	LIBOR
Line of Credit Facility, Amount Outstanding		0
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Sublimit, Revolving Credit Facility			25,000,000
Loans [Member]
Line of Credit Facility [Line Items]
Sublimit, Revolving Credit Facility			$ 10,000,000
Minimum [Member] | Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			0.75%
Debt Instrument, Basis Spread on Variable Rate	1.75%
Maximum [Member] | Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			1.75%
Debt Instrument, Basis Spread on Variable Rate	2.75%