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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Class A | Class C | Series A Preferred Stock | Common Stock Class A | Common Stock Class C | Preferred Stock Series A Preferred Stock | Additional Paid-In Capital | Retained Earnings | Total Shareholder's Equity | Non-controlling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2017 |  |  |  |  | 261,338,000 | 15,661,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | $ 3,003,972 |  |  |  | $ 26 | $ 2 | $ 0 | $ 2,767,558 | $ 66,639 | $ 2,834,225 | $ 169,747
Preferred shares outstanding at beginning of period (in shares) at Dec. 31, 2017 |  |  |  |  |  |  | 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued (in shares) |  |  |  |  | 199,000 |  |  |  |  |  |
Restricted stock forfeited (in shares) |  |  |  |  | (26,000) |  |  |  |  |  |
Restricted Stock Award, Forfeitures | 0 |  |  |  |  |  |  | 0 |  | 0 |
Restricted stock used for tax withholding (in shares) |  |  |  |  | (10,000) |  |  |  |  |  |
Restricted stock used for tax withholding | (192) |  |  |  |  |  |  | (192) |  | (192) |
Option exercises (in shares) |  |  |  |  | 10,000 |  |  |  |  |  |
Option exercises | 164 |  |  |  |  |  |  | 164 |  | 164 |
Stock-based compensation | 4,333 |  |  |  |  |  |  | 4,333 |  | 4,333 |
Conversion of common shares from Class C to Class A, net of tax (in shares) |  |  |  |  | 3,347,000 | (3,347,000) |  |  |  |  |
Conversion of common shares from Class C to Class A, net of tax | 6,669 |  |  |  | $ 1 | $ (1) |  | 42,188 |  | 42,188 | (35,519)
Net income (loss) | 70,772 |  |  |  |  |  |  |  | 66,090 | 66,090 | 4,682
Common shares outstanding at end of period (in shares) at Mar. 31, 2018 |  |  |  |  | 264,858,000 | 12,314,000 |  |  |  |  |
Balance at end of period at Mar. 31, 2018 | 3,085,718 |  |  |  | $ 27 | $ 1 | $ 0 | 2,814,051 | 132,729 | 2,946,808 | 138,910
Preferred shares outstanding at end of period (in shares) at Mar. 31, 2018 |  |  |  |  |  |  | 0 |  |  |  |
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2017 |  |  |  |  | 261,338,000 | 15,661,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | 3,003,972 |  |  |  | $ 26 | $ 2 | $ 0 | 2,767,558 | 66,639 | 2,834,225 | 169,747
Preferred shares outstanding at beginning of period (in shares) at Dec. 31, 2017 |  |  |  |  |  |  | 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 179,928 |  |  |  |  |  |  |  |  |  |
Common shares outstanding at end of period (in shares) at Sep. 30, 2018 |  |  |  |  | 265,771,000 | 12,003,000 |  |  |  |  |
Balance at end of period at Sep. 30, 2018 | 3,205,206 |  |  |  | $ 27 | $ 1 | $ 0 | 2,827,756 | 235,558 | 3,063,342 | 141,864
Preferred shares outstanding at end of period (in shares) at Sep. 30, 2018 |  |  |  |  |  |  | 0 |  |  |  |
Common shares outstanding at beginning of period (in shares) at Mar. 31, 2018 |  |  |  |  | 264,858,000 | 12,314,000 |  |  |  |  |
Balance at beginning of period at Mar. 31, 2018 | 3,085,718 |  |  |  | $ 27 | $ 1 | $ 0 | 2,814,051 | 132,729 | 2,946,808 | 138,910
Preferred shares outstanding at beginning of period (in shares) at Mar. 31, 2018 |  |  |  |  |  |  | 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued (in shares) |  |  |  |  | 23,000 |  |  |  |  |  |
Restricted stock forfeited (in shares) |  |  |  |  | (17,000) |  |  |  |  |  |
Restricted Stock Award, Forfeitures | 0 |  |  |  |  |  |  | 0 |  | 0 |
Restricted stock used for tax withholding (in shares) |  |  |  |  | (4,000) |  |  |  |  |  |
Restricted stock used for tax withholding | (65) |  |  |  |  |  |  | (65) |  | (65) |
Option exercises (in shares) |  |  |  |  | 28,000 |  |  |  |  |  |
Option exercises | 411 |  |  |  |  |  |  | 411 |  | 411 |
Stock-based compensation | 4,655 |  |  |  |  |  |  | 4,655 |  | 4,655 |
Net income (loss) | 67,482 |  |  |  |  |  |  |  | 63,541 | 63,541 | 3,941
Common shares outstanding at end of period (in shares) at Jun. 30, 2018 |  |  |  |  | 264,888,000 | 12,314,000 |  |  |  |  |
Balance at end of period at Jun. 30, 2018 | 3,158,201 |  |  |  | $ 27 | $ 1 | $ 0 | 2,819,052 | 196,270 | 3,015,350 | 142,851
Preferred shares outstanding at end of period (in shares) at Jun. 30, 2018 |  |  |  |  |  |  | 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued (in shares) |  |  |  |  | 697,000 |  |  |  |  |  |
Restricted stock forfeited (in shares) |  |  |  |  | (93,000) |  |  |  |  |  |
Restricted Stock Award, Forfeitures | 0 |  |  |  |  |  |  | 0 |  | 0 |
Restricted stock used for tax withholding (in shares) |  |  |  |  | (46,000) |  |  |  |  |  |
Restricted stock used for tax withholding | (862) |  |  |  |  |  |  | (862) |  | (862) |
Option exercises (in shares) |  |  |  |  | 14,000 |  |  |  |  |  |
Option exercises | 272 |  |  |  |  |  |  | 272 |  | 272 |
Stock-based compensation | 5,341 |  |  |  |  |  |  | 5,341 |  | 5,341 |
Conversion of common shares from Class C to Class A, net of tax (in shares) |  |  |  |  | 311,000 | (311,000) |  |  |  |  |
Conversion of common shares from Class C to Class A, net of tax | 580 |  |  |  | $ 0 | $ 0 |  | 3,953 |  | 3,953 | (3,373)
Net income (loss) | 41,674 |  |  |  |  |  |  |  | 39,288 | 39,288 | 2,386
Common shares outstanding at end of period (in shares) at Sep. 30, 2018 |  |  |  |  | 265,771,000 | 12,003,000 |  |  |  |  |
Balance at end of period at Sep. 30, 2018 | 3,205,206 |  |  |  | $ 27 | $ 1 | $ 0 | 2,827,756 | 235,558 | 3,063,342 | 141,864
Preferred shares outstanding at end of period (in shares) at Sep. 30, 2018 |  |  |  |  |  |  | 0 |  |  |  |
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2018 |  | 264,323,328 | 12,003,183 |  | 265,859,000 | 12,003,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 3,243,869 |  |  |  | $ 27 | $ 1 | $ 0 | 2,833,611 | 266,538 | 3,100,177 | 143,692
Preferred shares outstanding at beginning of period (in shares) at Dec. 31, 2018 |  |  |  | 1 |  |  | 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued (in shares) |  |  |  |  | 436,000 |  |  |  |  |  |
Restricted stock used for tax withholding (in shares) |  |  |  |  | (24,000) |  |  |  |  |  |
Restricted stock used for tax withholding | (291) |  |  |  |  |  |  | (291) |  | (291) |
Stock-based compensation | 6,483 |  |  |  |  |  |  | 6,483 |  | 6,483 |
Net income (loss) | (8,537) |  |  |  |  |  |  |  | (8,112) | (8,112) | (425)
Common shares outstanding at end of period (in shares) at Mar. 31, 2019 |  |  |  |  | 266,271,000 | 12,003,000 |  |  |  |  |
Balance at end of period at Mar. 31, 2019 | 3,241,524 |  |  |  | $ 27 | $ 1 | $ 0 | 2,839,803 | 258,426 | 3,098,257 | 143,267
Preferred shares outstanding at end of period (in shares) at Mar. 31, 2019 |  |  |  |  |  |  | 0 |  |  |  |
Common shares outstanding at beginning of period (in shares) at Dec. 31, 2018 |  | 264,323,328 | 12,003,183 |  | 265,859,000 | 12,003,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | $ 3,243,869 |  |  |  | $ 27 | $ 1 | $ 0 | 2,833,611 | 266,538 | 3,100,177 | 143,692
Preferred shares outstanding at beginning of period (in shares) at Dec. 31, 2018 |  |  |  | 1 |  |  | 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Option exercises (in shares) | 0 |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 6,752 |  |  |  |  |  |  |  |  |  |
Common shares outstanding at end of period (in shares) at Sep. 30, 2019 |  | 275,556,804 | 1,143,039 |  | 280,444,000 | 1,143,000 |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | 3,253,814 |  |  |  | $ 28 | $ 0 | $ 0 | 2,967,149 | 272,718 | 3,239,895 | 13,919
Preferred shares outstanding at end of period (in shares) at Sep. 30, 2019 |  |  |  | 1 |  |  | 0 |  |  |  |
Common shares outstanding at beginning of period (in shares) at Mar. 31, 2019 |  |  |  |  | 266,271,000 | 12,003,000 |  |  |  |  |
Balance at beginning of period at Mar. 31, 2019 | 3,241,524 |  |  |  | $ 27 | $ 1 | $ 0 | 2,839,803 | 258,426 | 3,098,257 | 143,267
Preferred shares outstanding at beginning of period (in shares) at Mar. 31, 2019 |  |  |  |  |  |  | 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued (in shares) |  |  |  |  | 4,000 |  |  |  |  |  |
Restricted stock forfeited (in shares) |  |  |  |  | (16,000) |  |  |  |  |  |
Restricted Stock Award, Forfeitures | 0 |  |  |  |  |  |  | 0 |  | 0 |
Restricted stock used for tax withholding (in shares) |  |  |  |  | (4,000) |  |  |  |  |  |
Restricted stock used for tax withholding | (41) |  |  |  |  |  |  | (41) |  | (41) |
Stock-based compensation | 6,758 |  |  |  |  |  |  | 6,758 |  | 6,758 |
Net income (loss) | 19,002 |  |  |  |  |  |  |  | 17,877 | 17,877 | 1,125
Common shares outstanding at end of period (in shares) at Jun. 30, 2019 |  |  |  |  | 266,255,000 | 12,003,000 |  |  |  |  |
Balance at end of period at Jun. 30, 2019 | 3,267,243 |  |  |  | $ 27 | $ 1 | $ 0 | 2,846,520 | 276,303 | 3,122,851 | 144,392
Preferred shares outstanding at end of period (in shares) at Jun. 30, 2019 |  |  |  |  |  |  | 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued (in shares) |  |  |  |  | 3,466,000 |  |  |  |  |  |
Restricted stock forfeited (in shares) |  |  |  |  | (30,000) |  |  |  |  |  |
Restricted Stock Award, Forfeitures | 0 |  |  |  |  |  |  | 0 |  | 0 |
Restricted stock used for tax withholding (in shares) |  |  |  |  | (107,000) |  |  |  |  |  |
Restricted stock used for tax withholding | (579) |  |  |  |  |  |  | (579) |  | (579) |
Stock-based compensation | 8,110 |  |  |  |  |  |  | 8,110 |  | 8,110 |
Conversion of common shares from Class C to Class A, net of tax (in shares) |  |  |  |  | 10,860,000 | (10,860,000) |  |  |  |  |
Conversion of common shares from Class C to Class A, net of tax | (17,247) |  |  |  | $ 1 | $ (1) |  | 113,098 |  | 113,098 | (130,345)
Net income (loss) | (3,713) |  |  |  |  |  |  |  | (3,585) | (3,585) | (128)
Common shares outstanding at end of period (in shares) at Sep. 30, 2019 |  | 275,556,804 | 1,143,039 |  | 280,444,000 | 1,143,000 |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | $ 3,253,814 |  |  |  | $ 28 | $ 0 | $ 0 | $ 2,967,149 | $ 272,718 | $ 3,239,895 | $ 13,919
Preferred shares outstanding at end of period (in shares) at Sep. 30, 2019 |  |  |  | 1 |  |  | 0 |  |  |  |

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