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Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 8 Months Ended | 20 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Nov. 05, 2019 | Feb. 22, 2019 | Nov. 07, 2018
Number of shares repurchased (in shares) | 262,889 |  | 196,885 |  | 524,444 | 446,003 |  |  |  |  |
Share repurchase cost | $ 20,025 |  | $ 14,878 |  | $ 34,152 | $ 19,499 |  |  |  |  |
2019 ASR Agreement |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  | 73,455 |  |  | 73,455 |  | 465,956 |  |  |  |
Average price per share (in dollars per share) |  |  |  |  |  |  | $ 107.31 |  |  |  |
Initial number of shares delivered under ASR agreement (in shares) |  |  |  |  |  |  |  |  | 392,501 |  |
Initial percentage of shares delivered under ASR agreement |  |  |  |  |  |  |  |  | 85.00% |  |
Initial value of shares delivered under ASR agreement |  |  |  |  |  |  |  |  | $ 50,000 |  |
2018 ASR Agreement |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  |  | 176,327 |  | 176,327 |  | 973,252 |  |  |
Average price per share (in dollars per share) |  |  |  |  |  |  |  | $ 51.37 |  |  |
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 | 2019 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  |  |  |  |  |  | $ 200,000 |

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