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Equity Issuances (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
Equity [Abstract]  
Common Stock, Shares, Issued 12,650,000 [1]
Share Price $ 54.00
Gross Proceeds from Issuance of Common Stock $ 683,100,000
Net proceeds 660,947,000 [2]
Common Stock, shares issued under shareholder options 1,650,000
Payments of Stock Issuance Costs $ 600,000
[1] Includes 1,650,000 common shares purchased pursuant to the exercise of the Underwriters' option to purchase additional common shares.
[2] Includes additional issue costs of $0.6 million which were paid in July 2014.