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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, 2016 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Mar. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) segment $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Net Income (loss) Per Common Share |  |  |  |  |  |  |  |  |  |  |
Number of outstanding options not included in computation of Diluted EPS (in shares) |  |  |  |  |  |  |  |  | 2,077,000 | 505,000 | 3,191,000
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ | $ (270,244) | $ 41,322 | $ 40,244 | $ 27,092 | $ 40,454 | $ 36,268 | $ 31,475 | $ 9,620 | $ (161,586) | $ 117,817 | $ (24,154)
Denominator |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per-share weighted average shares | 51,757,000 | 51,627,000 | 51,418,000 | 51,218,000 | 50,880,000 | 50,616,000 | 51,357,000 | 51,457,000 | 51,505,000 | 51,077,000 | 51,237,000
Dilution due to stock options and restricted stock units (in shares) |  |  |  |  |  |  |  |  |  | 748,000 |
Weighted average number of shares for diluted net income per common share | 51,757,000 | 52,471,000 | 52,194,000 | 52,014,000 | 51,657,000 | 51,282,000 | 51,971,000 | 52,392,000 | 51,505,000 | 51,825,000 | 51,237,000
Basic earnings per share (in dollars per share) | $ / shares | $ (5.22) | $ 0.80 | $ 0.78 | $ 0.53 | $ 0.80 | $ 0.72 | $ 0.61 | $ 0.19 | $ (3.14) | $ 2.31 | $ (0.47)
Diluted earnings per share (in dollars per share) | $ / shares | $ (5.22) | $ 0.79 | $ 0.77 | $ 0.52 | $ 0.78 | $ 0.71 | $ 0.61 | $ 0.18 | $ (3.14) | $ 2.27 | $ (0.47)
Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |
Fair value of long-term debt | $ | $ 2,566,500 |  |  |  | $ 1,939,800 |  |  |  | $ 2,566,500 | $ 1,939,800 |
Carrying amount of long-term debt | $ | $ 2,545,511 |  |  |  | $ 1,927,901 |  |  |  | $ 2,545,511 | $ 1,927,901 |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 3 |  |

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