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Stock Repurchase Programs (Details) (USD $)
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1 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | ||||
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Dec. 31, 2012
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Dec. 31, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Apr. 30, 2012
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Dec. 18, 2013
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Nov. 10, 2013
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| Equity, Class of Treasury Stock [Line Items] | ||||||||
| Shares repurchased | 100,000 | 10,200,000 | ||||||
| Repurchase of common stock | $ 600,000 | $ 199,900,000 | $ 0 | $ 201,496,000 | $ 602,000 | |||
| Share Price | $ 19.50 | |||||||
| 2012 Repurchase Program | ||||||||
| Equity, Class of Treasury Stock [Line Items] | ||||||||
| Stock repurchase program, authorized amount | $ 75,000,000 | |||||||
| Stock repurchase program, period in force | 12 months | |||||||
| Tender Offer Repurchase Program 2013 [Member] [Domain] | ||||||||
| Equity, Class of Treasury Stock [Line Items] | ||||||||
| Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 10,250,000 | |||||||
| Stock Options | ||||||||
| Equity, Class of Treasury Stock [Line Items] | ||||||||
| Shares repurchased | 200,000 | |||||||