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Nature of Operations and Summary of Significant Accounting Policies - Net Income (Loss) Per Share and Fair Value (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) segment $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Net Income (loss) Per Common Share |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding units not included in computation of Diluted EPS (in shares) |  |  |  |  |  |  |  |  | 207,000 | 284,000 |  | 2,077,000 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ | $ 67,105 | $ 83,046 | $ 75,859 | $ 54,362 | $ 289,928 | $ 53,716 | $ 50,477 | $ 34,786 | $ 280,372 | $ 428,907 | [1] | $ (161,586) | [1]
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share weighted average shares (in shares) | 51,650,000 | 52,039,000 | 52,046,000 | 51,921,000 | 51,811,000 | 51,833,000 | 51,751,000 | 51,820,000 | 51,914,000 | 51,804,000 | [1] | 51,505,000 | [1]
Dilution due to stock options and restricted stock units (in shares) |  |  |  |  |  |  |  |  | 957,000 | 1,296,000 |  |  |
Diluted earnings per share weighted average shares (in shares) | 52,556,000 | 52,981,000 | 52,913,000 | 53,033,000 | 53,140,000 | 53,080,000 | 52,977,000 | 53,202,000 | 52,871,000 | 53,100,000 | [1] | 51,505,000 | [1]
Basic earnings (loss) per-share (in dollars per share) | $ / shares | $ 1.30 | $ 1.60 | $ 1.46 | $ 1.05 | $ 5.60 | $ 1.04 | $ 0.98 | $ 0.67 | $ 5.40 | $ 8.28 | [1] | $ (3.14) | [1]
Diluted earnings (loss) per-share (in dollars per share) | $ / shares | $ 1.28 | $ 1.57 | $ 1.43 | $ 1.03 | $ 5.46 | $ 1.01 | $ 0.95 | $ 0.65 | $ 5.30 | $ 8.08 | [1] | $ (3.14) | [1]
Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of long-term debt | $ | $ 3,157,300 |  |  |  | $ 2,698,400 |  |  |  | $ 3,157,300 | $ 2,698,400 |  |  |
Total long-term debt | $ | $ 3,185,438 |  |  |  | $ 2,712,350 |  |  |  | $ 3,185,438 | $ 2,712,350 |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 3 |  |  |  |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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