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Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Feb. 28, 2017 | Dec. 31, 2016 | Jul. 05, 2017 | Feb. 24, 2017
Number of shares repurchased (in shares) | 2,365,836 |  | 673,626 |  |
Share repurchase cost | $ 139,286 |  | $ 22,296 |  |
2016 Repurchase program |  |  |  |  |
Number of shares repurchased (in shares) |  | 788,399 |  |  |
Share repurchase cost |  | $ 26,600 |  |  |
Average price per share (in dollars per share) |  | $ 33.72 |  |  |
2017 Repurchase program |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  | $ 200,000
2017 ASR Agreement |  |  |  |  |
Payment under ASR agreement |  |  |  | $ 100,000 |
Initial number of shares delivered under ASR agreement (in shares) |  |  |  | 1,500,000 |
Initial percentage of shares delivered under ASR agreement |  |  |  | 80.00% |

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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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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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