Subsequent Events (Details) (USD $)	6 Months Ended	0 Months Ended
	Jun. 30, 2014 item	Jul. 15, 2014 4.25% Notes Due 2024 [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Number of types of subsequent events	2
Principal amount of notes issued		$ 300,000,000
Stated interest rate	6.70%	4.25%
Redemption price as a percentage of principal amount		100.00%
Proceeds from the Notes issuance		$ 295,300,000