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Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019 | Jan. 31, 2019 | Mar. 31, 2017 | Feb. 29, 2004
Stock repurchase program |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Value |  |  |  | $ 7,716 | $ 2,486 | $ 2,173 |  |  |  |
CSFL |  |  |  |  |  |  |  |  |  |
Stock repurchase program |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  |  | 86,263 |  |  |  |  |  |
Stock Repurchased During Period, Value |  |  |  | $ 5,200 |  |  |  |  |  |
Announced stock repurchase program |  |  |  |  |  |  |  |  |  |
Stock repurchase program |  |  |  |  |  |  |  |  |  |
Shares authorized under repurchase program |  |  |  |  |  |  |  |  |  | 250,000
Stock Repurchased During Period, Shares |  |  |  | 320,000 | 2,165,000 |  |  |  |  |
Average price per share |  |  |  | $ 77.23 | $ 72.49 |  |  |  |  |
Stock Repurchased During Period, Value | $ 24,700 | $ 68,400 | $ 68,400 | $ 24,700 | $ 156,900 |  |  |  |  |
Other stock repurchase arrangements |  |  |  |  |  |  |  |  |  |
Stock repurchase program |  |  |  |  |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  |  | 122,708 | 35,674 | 25,251 |  |  |  |
Stock Repurchased During Period, Value |  |  |  | $ 7,700 | $ 2,500 | $ 2,200 |  |  |  |
2019 Stock Repurchase Program |  |  |  |  |  |  |  |  |  |
Stock repurchase program |  |  |  |  |  |  |  |  |  |
Shares authorized under repurchase program |  |  |  |  |  |  | 2,000,000 | 1,000,000 |  |
Stock Repurchased During Period, Shares |  |  |  | 1,485,000 |  |  |  |  |  |
Average price per share |  |  |  |  |  |  | $ 75.26 |  |  |
Number of shares expired |  |  |  | 515,000 |  |  |  |  |  |
2004 plan |  |  |  |  |  |  |  |  |  |
Stock repurchase program |  |  |  |  |  |  |  |  |  |
Shares authorized under repurchase program |  |  |  |  |  |  |  |  | 1,000,000 |

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- Definition The number of shares expired during the period earlier authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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