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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, 2017 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) segment $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares
Net Income (loss) Per Common Share |  |  |  |  |  |  |  |  |  |  |
Number of outstanding options not included in computation of Diluted EPS (in shares) |  |  |  |  |  |  |  |  | 284,000 | 2,077,000 | 505,000,000
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ | $ 289,928 | $ 53,716 | $ 50,477 | $ 34,786 | $ (270,244) | $ 41,322 | $ 40,244 | $ 27,092 | $ 428,907 | $ (161,586) | $ 117,817
Denominator |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per-share weighted average shares | 51,811,000 | 51,833,000 | 51,751,000 | 51,820,000 | 51,757,000 | 51,627,000 | 51,418,000 | 51,218,000 | 51,804,000 | 51,505,000 | 51,077,000
Dilution due to stock options and restricted stock units (in shares) |  |  |  |  |  |  |  |  | 1,296,000 |  | 748,000
Weighted average number of shares for diluted net income per common share | 53,140,000 | 53,080,000 | 52,977,000 | 53,202,000 | 51,757,000 | 52,471,000 | 52,194,000 | 52,014,000 | 53,100,000 | 51,505,000 | 51,825,000
Basic earnings per-share (in dollars per share) | $ / shares | $ 5.60 | $ 1.04 | $ 0.98 | $ 0.67 | $ (5.22) | $ 0.80 | $ 0.78 | $ 0.53 | $ 8.28 | $ (3.14) | $ 2.31
Diluted earnings per-share (in dollars per share) | $ / shares | $ 5.46 | $ 1.01 | $ 0.95 | $ 0.65 | $ (5.22) | $ 0.79 | $ 0.77 | $ 0.52 | $ 8.08 | $ (3.14) | $ 2.27
Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |
Fair value of long-term debt | $ | $ 2,698,400 |  |  |  | $ 2,566,500 |  |  |  | $ 2,698,400 | $ 2,566,500 |
Total long-term debt | $ | $ 2,712,350 |  |  |  | $ 2,570,904 |  |  |  | $ 2,712,350 | $ 2,570,904 |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 3 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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