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Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands | 2 Months Ended | 12 Months Ended | 18 Months Ended | 20 Months Ended | 22 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 28, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Nov. 07, 2018 | Jul. 05, 2017 | Feb. 24, 2017
Number of shares repurchased (in shares) |  | 1,063,528 | 2,365,836 |  |  |  |  |  |  |
Share repurchase cost |  | $ 65,025 | $ 139,286 | $ 26,600 |  |  |  |  |  |
Average price per share (in dollars per share) |  |  |  | $ 33.72 |  |  |  |  |  |
2016 Repurchase program |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  | 788,399 |  |  |  |  |  |
2017 Repurchase program |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  |  |  | 996,566 |  |  |
Share repurchase cost |  |  |  |  |  |  | $ 50,000 |  |  |
Average price per share (in dollars per share) |  |  |  |  |  |  | $ 50.17 |  |  |
2017 ASR Agreement |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 13,657 |  |  |  | 1,521,100 |  |  |  |
Share repurchase cost |  |  |  |  | $ 100,000 |  |  |  |  |
Average price per share (in dollars per share) |  |  |  |  |  | $ 65.74 |  |  |  |
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% |
2018 ASR Agreement |  |  |  |  |  |  |  |  |  |
Share repurchase cost | $ 50,000 |  |  |  |  |  |  |  |  |
Initial number of shares delivered under ASR agreement (in shares) |  |  |  |  |  |  |  | 796,925 |  |
Initial percentage of shares delivered under ASR agreement |  |  |  |  |  |  |  | 85.00% |  |
Initial value of shares delivered under ASR agreement |  |  |  |  |  |  |  | $ 50,000 |  |
Maximum | 2017 Repurchase program |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  |  |  |  |  |  | $ 200,000

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