Shareholders Equity (Details) (USD $)	1 Months Ended	3 Months Ended		12 Months Ended
	Jun. 30, 2013	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Jul. 02, 2013
Class of Stock [Line Items]
Proceeds from shares sold by certain selling stockholders		$ 0		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date		5.00%
Share Price					$ 17.00
Proceeds from Issuance Initial Public Offering				424,700,000
Secondary-offering related expenses		400,000
Stockholders' Equity Note, Stock Split, Conversion Ratio	143.0299613
Common shares, par value		$ 0.01		$ 0.01
Allocated Share-based Compensation Expense		3,300,000	1,900,000
Coworker Stock Purchase Plan [Member]
Class of Stock [Line Items]
Allocated Share-based Compensation Expense		$ 0
Secondary offering over-allotment [Member]
Class of Stock [Line Items]
Shares sold by certain selling stockholders		1,500,000		2,250,000
Secondary Offering [Member]
Class of Stock [Line Items]
Shares sold by certain selling stockholders		11,500,000		15,000,000
IPO Over-allotment [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues				3,487,500
IPO [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues				23,250,000