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Quarterly Financial Information (Unaudited) - Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 446,285 | $ 379,787 | $ 407,719 | $ 370,775 | $ 360,565 | $ 292,249 | $ 333,934 | $ 288,370 | $ 1,604,566 | $ 1,275,118 | $ 1,184,719
Depreciation and amortization | 53,287 | 53,998 | 53,553 | 53,009 | 31,221 | 30,994 | 29,995 | 28,666 | 213,847 | 120,876 | 111,959
Total operating income | 71,748 | 56,503 | 85,316 | 53,964 | 51,526 | 40,100 | 76,699 | 45,944 | 267,531 | 214,269 | 185,917
Income before income taxes | 43,182 | 24,427 | 54,516 | 24,644 | 161,191 | 24,454 | 61,222 | 29,548 | 146,769 | 276,415 | 126,945
Income before income taxes | (4,732) | (3,537) | (8,232) | (1,974) | (1,997) | (1,863) | (5,676) | (2,209) | (18,475) | (11,745) | 49,155
Net income | 38,450 | 20,890 | 46,284 | 22,670 | 159,194 | 22,591 | 55,546 | 27,339 | 128,294 | 264,670 | 176,100
Net income available to common shareholders | $ 44,654 | $ 22,349 | $ 49,383 | $ 29,408 | $ 159,194 | $ 22,591 | $ 55,546 | $ 27,339 | $ 145,794 | $ 264,670 | $ 176,100
Basic income per share available to common stockholders | $ 0.86 | $ 0.43 | $ 0.96 | $ 0.57 | $ 3.10 | $ 0.44 | $ 1.08 | $ 0.53 | $ 2.82 | $ 5.16 | $ 3.44
Diluted income per share available to common stockholders | $ 0.85 | $ 0.43 | $ 0.95 | $ 0.57 | $ 3.09 | $ 0.44 | $ 1.08 | $ 0.53 | $ 2.81 | $ 5.14 | $ 3.43

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