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Stockholders' Equity (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 118 Months Ended | 161 Months Ended | 177 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 06, 2019 | May 20, 2019 | May 05, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2020 | Mar. 13, 2020 | Mar. 05, 2019 | May 16, 2018 | May 19, 2015
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 20,000,000 | $ 20,000,000 | $ 15,000,000 |
Stock repurchased during period (in shares) |  |  |  | 246,460 | 128,504 |  |  | 13,797,694 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  | $ 12,518,000 | $ 5,071,000 |  |  | $ 221,833,000 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  | $ 50.79 | $ 39.46 |  |  | $ 16.08 |  |  |  |
Dividend Declared |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.16 | $ 0.16 |  |  |  |  |  |  |  |  |  |
Open market |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 5,700,000
Stock repurchased during period (in shares) |  |  |  | 103,689 | 5,799 | 4,205,255 |  |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  | $ 4,987,000 | $ 200,000 | $ 74,793,000 |  |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  | $ 48.10 | $ 34.46 | $ 17.79 |  |  |  |  |  |
401(k) |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  | 123,672 | 107,000 |  |  | 7,591,411 |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  | $ 6,578,000 | $ 4,283,000 |  |  | $ 126,505,000 |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  | $ 53.19 | $ 40.03 |  |  | $ 16.66 |  |  |  |
401(k) | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  | 23,305 |  |  |  |  |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |
Directors and employees |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Shareholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  | 19,099 | 15,705 |  | 2,001,028 |  |  |  |  |
Aggregate price of shares repurchased since inception |  |  |  | $ 953,000 | $ 588,000 |  | $ 20,535,000 |  |  |  |  |
Average price of shares repurchased since inception (per share) |  |  |  | $ 49.90 | $ 37.44 |  | $ 10.26 |  |  |  |  |

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