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Condensed Consolidating Financial Information (Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | $ 332,172 | $ 333,389 |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | (107,634) | (161,252) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | (367,333) | (1,153) | $ (1,153) |
Net activity with affiliates |  |  | 0 | 0 |  |
Advances pursuant to development agreement |  |  | 0 | 35,108 |  |
Other investing activities |  |  | (10,590) | 492 |  |
Net cash used in investing activities |  |  | (485,557) | (197,021) |  |
Cash flows from financing activities |  |  |  |  |  |
Borrowings under bank credit facility |  |  | 413,000 | 463,300 |  |
Payments under bank credit facility |  |  | (633,022) | (628,211) |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 700,000 | 0 |  |
Debt issue costs |  |  | (14,016) | (2,700) |  |
Net activity with affiliates |  |  | 0 | 0 |  |
Share-based compensation activities, net |  |  | (2,837) | (1,993) |  |
Stock Repurchased and Retired During Period, Value | $ (14,489) | $ (11,070) | (44,822) | (22,160) |  |
Payments of Ordinary Dividends, Common Stock |  |  | (18,009) | (5,653) |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | 503 | (111) |  |  |
Net cash provided by (used in) financing activities |  |  | 400,183 | (196,914) |  |
Cash flows from operating activities |  |  | 0 | (514) |  |
Cash flows from investing activities |  |  | 482 | 36,247 |  |
Cash flows from financing activities |  |  | 0 | 0 |  |
Net cash provided by discontinued operations |  |  | 482 | 35,733 |  |
Cash and cash equivalents, beginning of period | 474,559 | 185,537 | 474,559 | 185,537 | 210,350 | $ 227,279
Net change in cash, cash equivalents and restricted cash |  |  | 247,280 | (24,813) |  |
Parent |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | (114,336) | (39,365) |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | (67,866) | (82,241) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | (367,333) |  | (1,153) |
Net activity with affiliates |  |  | 0 | 0 |  |
Advances pursuant to development agreement |  |  |  | 0 |  |
Other investing activities |  |  | (9,240) | 0 |  |
Net cash used in investing activities |  |  | (444,439) | (83,394) |  |
Cash flows from financing activities |  |  |  |  |  |
Borrowings under bank credit facility |  |  | 413,000 | 463,300 |  |
Payments under bank credit facility |  |  | (633,022) | (628,211) |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 700,000 |  |  |
Debt issue costs |  |  | (14,016) | (2,700) |  |
Net activity with affiliates |  |  | 415,333 | 318,333 |  |
Share-based compensation activities, net |  |  | (2,837) | (1,993) |  |
Stock Repurchased and Retired During Period, Value |  |  | (44,822) | (22,160) |  |
Payments of Ordinary Dividends, Common Stock |  |  | 18,009 | 5,653 |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | 590 | 0 |  |  |
Net cash provided by (used in) financing activities |  |  | 815,627 | 121,506 |  |
Cash flows from operating activities |  |  | 0 | 0 |  |
Cash flows from investing activities |  |  | 0 | 0 |  |
Cash flows from financing activities |  |  | 0 | 0 |  |
Net cash provided by discontinued operations |  |  | 0 | 0 |  |
Cash and cash equivalents, beginning of period | 257,199 | (41) | 257,199 | (41) | 1,212 | 347
Net change in cash, cash equivalents and restricted cash |  |  | 256,852 | (1,253) |  |
Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | 420,938 | 378,048 |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | (39,008) | (78,801) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 0 |  | 0 |
Net activity with affiliates |  |  | (415,943) | (326,451) |  |
Advances pursuant to development agreement |  |  |  | 0 |  |
Other investing activities |  |  | 0 | 492 |  |
Net cash used in investing activities |  |  | (454,951) | (404,760) |  |
Cash flows from financing activities |  |  |  |  |  |
Borrowings under bank credit facility |  |  | 0 | 0 |  |
Payments under bank credit facility |  |  | 0 | 0 |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 0 |  |  |
Debt issue costs |  |  | 0 | 0 |  |
Net activity with affiliates |  |  | 0 | 0 |  |
Share-based compensation activities, net |  |  | 0 | 0 |  |
Stock Repurchased and Retired During Period, Value |  |  | 0 | 0 |  |
Payments of Ordinary Dividends, Common Stock |  |  | 0 | 0 |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | (87) | (100) |  |  |
Net cash provided by (used in) financing activities |  |  | (100) | (87) |  |
Cash flows from operating activities |  |  | 0 | 0 |  |
Cash flows from investing activities |  |  | 0 | 0 |  |
Cash flows from financing activities |  |  | 0 | 0 |  |
Net cash provided by discontinued operations |  |  | 0 | 0 |  |
Cash and cash equivalents, beginning of period | 179,850 | 172,811 | 179,850 | 172,811 | 199,610 | 213,963
Net change in cash, cash equivalents and restricted cash |  |  | (34,113) | (26,799) |  |
Subsidiary, BAC [Member] |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | (135) | (964) |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | 0 | 0 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 0 | 0 |  |
Net activity with affiliates |  |  | (347) | (34,769) |  |
Advances pursuant to development agreement |  |  |  | 0 |  |
Other investing activities |  |  | 0 | 0 |  |
Net cash used in investing activities |  |  | (347) | (34,769) |  |
Cash flows from financing activities |  |  |  |  |  |
Borrowings under bank credit facility |  |  | 0 | 0 |  |
Payments under bank credit facility |  |  | 0 | 0 |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 0 |  |  |
Debt issue costs |  |  | 0 | 0 |  |
Net activity with affiliates |  |  | 0 | 0 |  |
Share-based compensation activities, net |  |  | 0 | 0 |  |
Stock Repurchased and Retired During Period, Value |  |  | 0 | 0 |  |
Payments of Ordinary Dividends, Common Stock |  |  | 0 | 0 |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | 0 | 0 |  |  |
Net cash provided by (used in) financing activities |  |  | 0 | 0 |  |
Cash flows from operating activities |  |  | 0 | (514) |  |
Cash flows from investing activities |  |  | 482 | 36,247 |  |
Cash flows from financing activities |  |  | 0 | 0 |  |
Net cash provided by discontinued operations |  |  | 482 | 35,733 |  |
Cash and cash equivalents, beginning of period | 0 | 0 | 0 | 0 | 0 | 0
Net change in cash, cash equivalents and restricted cash |  |  | 0 | 0 |  |
Non-Guarantor Subsidiaries (100% Owned) |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | 25,372 | (6,020) |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | (760) | (210) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 0 |  | 0 |
Net activity with affiliates |  |  | 0 | 0 |  |
Advances pursuant to development agreement |  |  |  | 35,108 |  |
Other investing activities |  |  | (1,350) | 0 |  |
Net cash used in investing activities |  |  | (2,110) | (35,318) |  |
Cash flows from financing activities |  |  |  |  |  |
Borrowings under bank credit facility |  |  | 0 | 0 |  |
Payments under bank credit facility |  |  | 0 | 0 |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 0 |  |  |
Debt issue costs |  |  | 0 | 0 |  |
Net activity with affiliates |  |  | 1,290 | 44,577 |  |
Share-based compensation activities, net |  |  | 0 | 0 |  |
Stock Repurchased and Retired During Period, Value |  |  | 0 | 0 |  |
Payments of Ordinary Dividends, Common Stock |  |  | 0 | 0 |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | 0 | (11) |  |  |
Net cash provided by (used in) financing activities |  |  | 1,279 | 44,577 |  |
Cash flows from operating activities |  |  | 0 | 0 |  |
Cash flows from investing activities |  |  | 0 | 0 |  |
Cash flows from financing activities |  |  | 0 | 0 |  |
Net cash provided by discontinued operations |  |  | 0 | 0 |  |
Cash and cash equivalents, beginning of period | 37,510 | 12,767 | 37,510 | 12,767 | 9,528 | 12,969
Net change in cash, cash equivalents and restricted cash |  |  | 24,541 | 3,239 |  |
Non-Guarantor Subsidiaries (Not 100% Owned) |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | 0 | 254 |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | 0 | 0 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 0 |  | 0 |
Net activity with affiliates |  |  | 0 | 0 |  |
Advances pursuant to development agreement |  |  |  | 0 |  |
Other investing activities |  |  | 0 | 0 |  |
Net cash used in investing activities |  |  | 0 | 0 |  |
Cash flows from financing activities |  |  |  |  |  |
Borrowings under bank credit facility |  |  | 0 | 0 |  |
Payments under bank credit facility |  |  | 0 | 0 |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 0 |  |  |
Debt issue costs |  |  | 0 | 0 |  |
Net activity with affiliates |  |  | 0 | (254) |  |
Share-based compensation activities, net |  |  | 0 | 0 |  |
Stock Repurchased and Retired During Period, Value |  |  | 0 | 0 |  |
Payments of Ordinary Dividends, Common Stock |  |  | 0 | 0 |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | 0 | 0 |  |  |
Net cash provided by (used in) financing activities |  |  | 0 | (254) |  |
Cash flows from operating activities |  |  | 0 | 0 |  |
Cash flows from investing activities |  |  | 0 | 0 |  |
Cash flows from financing activities |  |  | 0 | 0 |  |
Net cash provided by discontinued operations |  |  | 0 | 0 |  |
Cash and cash equivalents, beginning of period | 0 | 0 | 0 | 0 | 0 | 0
Net change in cash, cash equivalents and restricted cash |  |  | 0 | 0 |  |
Eliminations |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | 333 | 1,436 |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | 0 | 0 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 0 |  | 0 |
Net activity with affiliates |  |  | 416,290 | 361,220 |  |
Advances pursuant to development agreement |  |  |  | 0 |  |
Other investing activities |  |  | 0 | 0 |  |
Net cash used in investing activities |  |  | 416,290 | 361,220 |  |
Cash flows from financing activities |  |  |  |  |  |
Borrowings under bank credit facility |  |  | 0 | 0 |  |
Payments under bank credit facility |  |  | 0 | 0 |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 0 |  |  |
Debt issue costs |  |  | 0 | 0 |  |
Net activity with affiliates |  |  | (416,623) | (362,656) |  |
Share-based compensation activities, net |  |  | 0 | 0 |  |
Stock Repurchased and Retired During Period, Value |  |  | 0 | 0 |  |
Payments of Ordinary Dividends, Common Stock |  |  | 0 | 0 |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | 0 | 0 |  |  |
Net cash provided by (used in) financing activities |  |  | (416,623) | (362,656) |  |
Cash flows from operating activities |  |  | 0 | 0 |  |
Cash flows from investing activities |  |  | 0 | 0 |  |
Cash flows from financing activities |  |  | 0 | 0 |  |
Net cash provided by discontinued operations |  |  | 0 | 0 |  |
Cash and cash equivalents, beginning of period | $ 0 | $ 0 | 0 | 0 | $ 0 | $ 0
Net change in cash, cash equivalents and restricted cash |  |  | $ 0 | $ 0 |  |

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