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Shareholders Equity (Details) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Jul. 02, 2013
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Sep. 30, 2014
Coworker Stock Purchase Plan [Member]
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Sep. 30, 2014
Secondary offering over-allotment [Member]
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Jun. 30, 2014
Secondary offering over-allotment [Member]
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Mar. 31, 2014
Secondary offering over-allotment [Member]
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Dec. 31, 2013
Secondary offering over-allotment [Member]
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Sep. 30, 2014
Secondary Offering [Member]
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Jun. 30, 2014
Secondary Offering [Member]
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Mar. 31, 2014
Secondary Offering [Member]
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Dec. 31, 2013
Secondary Offering [Member]
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Dec. 31, 2013
IPO Over-allotment [Member]
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Jul. 31, 2013
IPO [Member]
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| Class of Stock [Line Items] | ||||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date | 5.00% | |||||||||||||||||||||||||||
| Allocated Share-based Compensation Expense | $ 3,900,000 | $ 40,300,000 | $ 44,300,000 | $ 0.0 | ||||||||||||||||||||||||
| Stock Issued During Period, Shares, New Issues | 3,487,500 | 23,250,000 | ||||||||||||||||||||||||||
| Share Price | $ 17.00 | |||||||||||||||||||||||||||
| Proceeds from Issuance Initial Public Offering | 424,700,000 | |||||||||||||||||||||||||||
| Shares sold by certain selling stockholders | 0 | [1],[2] | 2,250,000 | [1] | 1,500,000 | [1] | 2,250,000 | [1] | 15,000,000 | 15,000,000 | 10,000,000 | 15,000,000 | ||||||||||||||||
| Secondary-offering related expenses | 300,000 | 500,000 | 400,000 | 1,200,000 | 0 | 600,000 | ||||||||||||||||||||||
| Proceeds from shares sold by certain selling stockholders | $ 0 | $ 0 | ||||||||||||||||||||||||||
| Stockholders' Equity Note, Stock Split, Conversion Ratio | 143.0299613 | |||||||||||||||||||||||||||
| Common shares, par value | $ 0.01 | $ 0.01 | $ 0.01 | |||||||||||||||||||||||||
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