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Condensed Consolidating Financial Information (Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | $ 217,991 | $ 200,386 |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | (63,245) | (118,751) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | (100,713) |  | $ 0 |
Net activity with affiliates |  |  | 0 | 0 |  |
Advances pursuant to development agreement |  |  | 0 | 35,108 |  |
Other investing activities |  |  | (9,240) | 492 |  |
Net cash used in investing activities |  |  | (173,198) | (153,367) |  |
Cash flows from financing activities |  |  |  |  |  |
Borrowings under bank credit facility |  |  | 333,900 | 535,900 |  |
Payments under bank credit facility |  |  | (591,476) | (628,037) |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 700,000 |  | 0 |
Debt issue costs |  |  | (11,028) | (2,381) |  |
Net activity with affiliates |  |  | 0 | 0 |  |
Share-based compensation activities, net |  |  | (3,381) | (2,796) |  |
Stock Repurchased and Retired During Period, Value | $ (10,530) | $ (11,090) | (30,332) | (11,090) |  |
Payments of Ordinary Dividends, Common Stock |  |  | (11,267) | 0 |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | (95) | (50) |  |  |
Net cash provided by (used in) financing activities |  |  | 386,366 | (108,499) |  |
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 | 658,920 | 184,603 | 658,920 | 184,603 | 210,350 | $ 227,279
Net change in cash, cash equivalents and restricted cash |  |  | 431,641 | (25,747) |  |
Parent |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | (70,065) | (32,014) |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | (36,914) | (68,685) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | (100,713) |  |  |
Net activity with affiliates |  |  | 0 | 0 |  |
Advances pursuant to development agreement |  |  |  | 0 |  |
Other investing activities |  |  | (9,240) | 0 |  |
Net cash used in investing activities |  |  | (146,867) | (68,685) |  |
Cash flows from financing activities |  |  |  |  |  |
Borrowings under bank credit facility |  |  | 333,900 | 535,900 |  |
Payments under bank credit facility |  |  | (591,476) | (628,037) |  |
Proceeds from Issuance of Senior Long-term Debt |  |  | 700,000 |  |  |
Debt issue costs |  |  | (11,028) | (2,381) |  |
Net activity with affiliates |  |  | 277,000 | 207,941 |  |
Share-based compensation activities, net |  |  | (3,381) | (2,796) |  |
Stock Repurchased and Retired During Period, Value |  |  | (30,332) |  |  |
Payments of Ordinary Dividends, Common Stock |  |  | 11,267 |  |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | (50) | 0 |  |  |
Net cash provided by (used in) financing activities |  |  | 663,416 | 99,487 |  |
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 | 446,831 | 0 | 446,831 | 0 | 1,212 | 347
Net change in cash, cash equivalents and restricted cash |  |  | 446,484 | (1,212) |  |
Guarantor Subsidiaries [Member] |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | 282,907 | 239,394 |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | (26,059) | (49,966) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 0 |  |  |
Net activity with affiliates |  |  | (289,361) | (215,816) |  |
Advances pursuant to development agreement |  |  |  | 0 |  |
Other investing activities |  |  | 0 | 492 |  |
Net cash used in investing activities |  |  | (315,420) | (265,290) |  |
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 |  |  |
Payments of Ordinary Dividends, Common Stock |  |  | 0 |  |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | (45) | (50) |  |  |
Net cash provided by (used in) financing activities |  |  | (50) | (45) |  |
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 | 181,400 | 173,669 | 181,400 | 173,669 | 199,610 | 213,963
Net change in cash, cash equivalents and restricted cash |  |  | (32,563) | (25,941) |  |
Subsidiary, BAC [Member] |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Net cash from operating activities |  |  | (135) | (663) |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | 0 | 0 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 0 |  |  |
Net activity with affiliates |  |  | (347) | (35,070) |  |
Advances pursuant to development agreement |  |  |  | 0 |  |
Other investing activities |  |  | 0 | 0 |  |
Net cash used in investing activities |  |  | (347) | (35,070) |  |
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 |  |  |
Payments of Ordinary Dividends, Common Stock |  |  | 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 |  |  | 5,405 | (7,708) |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | (272) | (100) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 0 |  |  |
Net activity with affiliates |  |  | 0 | 0 |  |
Advances pursuant to development agreement |  |  |  | 35,108 |  |
Other investing activities |  |  | 0 | 0 |  |
Net cash used in investing activities |  |  | (272) | (35,208) |  |
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 |  |  | 12,587 | 44,322 |  |
Share-based compensation activities, net |  |  | 0 | 0 |  |
Stock Repurchased and Retired During Period, Value |  |  | 0 |  |  |
Payments of Ordinary Dividends, Common Stock |  |  | 0 |  |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | 0 | 0 |  |  |
Net cash provided by (used in) financing activities |  |  | 12,587 | 44,322 |  |
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 | 30,689 | 10,934 | 30,689 | 10,934 | 9,528 | 12,969
Net change in cash, cash equivalents and restricted cash |  |  | 17,720 | 1,406 |  |
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 |  |  |
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 |  |  |
Payments of Ordinary Dividends, Common Stock |  |  | 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 |  |  | (121) | 1,123 |  |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | 0 | 0 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 0 |  |  |
Net activity with affiliates |  |  | 289,708 | 250,886 |  |
Advances pursuant to development agreement |  |  |  | 0 |  |
Other investing activities |  |  | 0 | 0 |  |
Net cash used in investing activities |  |  | 289,708 | 250,886 |  |
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 |  |  | (289,587) | (252,009) |  |
Share-based compensation activities, net |  |  | 0 | 0 |  |
Stock Repurchased and Retired During Period, Value |  |  | 0 |  |  |
Payments of Ordinary Dividends, Common Stock |  |  | 0 |  |  |
Proceeds from (Payments for) Combined Other Financing Activities |  | 0 | 0 |  |  |
Net cash provided by (used in) financing activities |  |  | (289,587) | (252,009) |  |
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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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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