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Nature of Operations and Summary of Significant Accounting Policies - Net Income (Loss) Per Common Share and Fair Value (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) segment $ / shares shares | Dec. 31, 2019 USD ($) segment $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Net Income (Loss) Per Common Share |  |  |  |  |  |  |  |  |  |  |
Number of outstanding units not included in computation of Diluted EPS (in shares) |  |  |  |  |  |  |  |  | 1,074,375 | 150,000 | 207,000
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ | $ (46,450) | $ 33,662 | $ (25,715) | $ 29,988 | $ 72,527 | $ 91,339 | $ 88,052 | $ 88,181 | $ (8,515) | $ 340,099 | $ 280,372
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share weighted average shares (in shares) | 50,181,000 | 50,181,000 | 50,140,000 | 50,277,000 | 50,395,000 | 50,746,000 | 51,145,000 | 51,440,000 | 50,195,000 | 50,932,000 | 51,914,000
Dilution due to stock options and restricted stock units (in shares) |  |  |  |  |  |  |  |  |  | 443,000 | 957,000
Diluted earnings per share weighted average shares | 50,181,000 | 50,622,000 | 50,140,000 | 50,559,000 | 50,796,000 | 51,129,000 | 51,477,000 | 52,098,000 | 50,195,000 | 51,375,000 | 52,871,000
Basic earnings (loss) per share (in dollars per share) | $ / shares | $ (0.93) | $ 0.67 | $ (0.51) | $ 0.60 | $ 1.44 | $ 1.80 | $ 1.72 | $ 1.71 | $ (0.17) | $ 6.68 | $ 5.40
Diluted earnings (loss) per share (in dollars per share) | $ / shares | $ (0.93) | $ 0.66 | $ (0.51) | $ 0.59 | $ 1.43 | $ 1.79 | $ 1.71 | $ 1.69 | $ (0.17) | $ 6.62 | $ 5.30
Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |
Fair value of long-term debt | $ | $ 3,244,000 |  |  |  | $ 3,049,100 |  |  |  | $ 3,244,000 | $ 3,049,100 |
Total long-term debt | $ | $ 3,236,002 |  |  |  | $ 3,017,523 |  |  |  | $ 3,236,002 | $ 3,017,523 |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  | 3 |
Number of reporting segments | segment |  |  |  |  |  |  |  |  | 2 |  |

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