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Basis of Presentation Stock Repurchase Program (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Accelerated Share Repurchases [Line Items] |  |  |
Repurchase of common stock (in shares) |  | 1,148,410 |
Repurchase of common stock |  | $ 47,144,000 | $ 2,981,000
Average cost per share for repurchase of common stock (in USD per share) |  | $ 34.42 |
Treasury Stock |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Repurchase of common stock |  | $ 39,529,000 | $ 2,981,000
Additional Paid-in Capital |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Repurchase of common stock |  | 7,615,000 |
2015 Stock Repurchase Program |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Stock repurchase program, authorized amount | $ 50,000,000 | $ 50,000,000 |
Stock repurchase program, expiration date |  | Dec. 31, 2015 |
Repurchase of common stock (in shares) | 498,700 |  |
Initial delivery as a percent of total shares expected to be delivered under ASR | 70.00% |  |
Payment made under accelerated share repurchase | $ 25,000,000 | $ 25,000,000 |
2015 Stock Repurchase Program | Treasury Stock |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Repurchase of common stock | 17,400,000 |  |
2015 Stock Repurchase Program | Additional Paid-in Capital |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Repurchase of common stock | $ 7,600,000 |  |

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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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