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Stockholders' Equity (Share Buyback Program) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 03, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 6,094 | $ 5,560 | $ 3,783 | $ 4,329 | $ 5,756 | $ 10,950 |  |  |
November 2014 Share Repurchase Plan |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock buyback program, authorized amount | $ 160,000 |  |  |  |  |  | $ 160,000 |  |
Increase authorized for share buyback program |  |  |  |  |  |  |  |  | $ 20,000
Treasury Stock, Shares, Acquired (in Shares) | 317,212 |  |  | 214,256 |  |  | 820,637 | 1,190,362 |
Treasury Stock, Value, Acquired, Cost Method | $ 6,100 |  |  | $ 4,300 |  |  | $ 15,400 | $ 21,000 |

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