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Condensed Consolidating Financial Information (Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities |  |  |  |
Net cash from operating activities | $ 118,525 | $ 117,604 |  |
Cash flows from investing activities |  |  |  |
Capital expenditures | (25,918) | (80,038) |  |
Net activity with affiliates | 0 | 0 |  |
Advances pursuant to development agreement | 0 | 35,108 |  |
Other investing activities | (500) | 44 |  |
Net cash used in investing activities | (26,418) | (115,102) |  |
Cash flows from financing activities |  |  |  |
Borrowings under bank credit facility | 179,600 | 256,700 |  |
Payments under bank credit facility | (264,403) | (275,063) |  |
Debt issue costs | (9) | (1,889) |  |
Net activity with affiliates | 0 | 0 |  |
Share-based compensation activities, net | (3,589) | (3,826) |  |
Stock Repurchased and Retired During Period, Value | (19,803) | 0 |  |
Payments of Ordinary Dividends, Common Stock | (5,632) | 0 |  |
Proceeds from (Payments for) Combined Other Financing Activities | (50) | (95) |  |
Net cash provided by (used in) financing activities | (113,886) | (24,173) |  |
Cash flows from operating activities | 0 | (255) |  |
Cash flows from investing activities | 0 | 630 |  |
Cash flows from financing activities | 0 | 0 |  |
Net cash provided by discontinued operations | 0 | 375 |  |
Cash and cash equivalents, beginning of period | 205,500 | 189,054 | $ 227,279 | $ 210,350
Net change in cash, cash equivalents and restricted cash | (21,779) | (21,296) |  |
Parent |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash from operating activities | (19,900) | 22,216 |  |
Cash flows from investing activities |  |  |  |
Capital expenditures | (13,097) | (57,069) |  |
Net activity with affiliates | 0 | 0 |  |
Advances pursuant to development agreement |  | 0 |  |
Other investing activities | (500) | 0 |  |
Net cash used in investing activities | (13,597) | (57,069) |  |
Cash flows from financing activities |  |  |  |
Borrowings under bank credit facility | 179,600 | 256,700 |  |
Payments under bank credit facility | (264,403) | (275,063) |  |
Debt issue costs | (9) | (1,889) |  |
Net activity with affiliates | 146,984 | 59,547 |  |
Share-based compensation activities, net | (3,589) | (3,826) |  |
Stock Repurchased and Retired During Period, Value | (19,803) |  |  |
Payments of Ordinary Dividends, Common Stock | 5,632 |  |  |
Proceeds from (Payments for) Combined Other Financing Activities | 0 | (50) |  |
Net cash provided by (used in) financing activities | 33,148 | 35,419 |  |
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 | (2) | 1,778 | 347 | 1,212
Net change in cash, cash equivalents and restricted cash | (349) | 566 |  |
Guarantor Subsidiaries |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash from operating activities | 144,168 | 110,202 |  |
Cash flows from investing activities |  |  |  |
Capital expenditures | (12,692) | (22,951) |  |
Net activity with affiliates | (154,344) | (110,461) |  |
Advances pursuant to development agreement |  | 0 |  |
Other investing activities | 0 | 44 |  |
Net cash used in investing activities | (167,036) | (133,368) |  |
Cash flows from financing activities |  |  |  |
Borrowings under bank credit facility | 0 | 0 |  |
Payments under bank credit facility | 0 | 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 | (50) | (45) |  |
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 | 191,045 | 176,399 | 213,963 | 199,610
Net change in cash, cash equivalents and restricted cash | (22,918) | (23,211) |  |
Non-Guarantor Subsidiaries (100% Owned) |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash from operating activities | (5,115) | (15,757) |  |
Cash flows from investing activities |  |  |  |
Capital expenditures | (129) | (18) |  |
Net activity with affiliates | 0 | 0 |  |
Advances pursuant to development agreement |  | 35,108 |  |
Other investing activities | 0 | 0 |  |
Net cash used in investing activities | (129) | (35,126) |  |
Cash flows from financing activities |  |  |  |
Borrowings under bank credit facility | 0 | 0 |  |
Payments under bank credit facility | 0 | 0 |  |
Debt issue costs | 0 | 0 |  |
Net activity with affiliates | 6,732 | 52,232 |  |
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 | 6,732 | 52,232 |  |
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 | 14,457 | 10,877 | 12,969 | 9,528
Net change in cash, cash equivalents and restricted cash | 1,488 | 1,349 |  |
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 |  |
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 |  |
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
Net change in cash, cash equivalents and restricted cash | 0 | 0 |  |
Subsidiary, Wholly Owned [Member] |  |  |  |
Cash flows from operating activities |  |  |  |
Net cash from operating activities | 0 | 217 |  |
Cash flows from investing activities |  |  |  |
Capital expenditures | 0 | 0 |  |
Net activity with affiliates | 0 | (592) |  |
Advances pursuant to development agreement |  | 0 |  |
Other investing activities | 0 | 0 |  |
Net cash used in investing activities | 0 | (592) |  |
Cash flows from financing activities |  |  |  |
Borrowings under bank credit facility | 0 | 0 |  |
Payments under bank credit facility | 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 | (255) |  |
Cash flows from investing activities | 0 | 630 |  |
Cash flows from financing activities | 0 | 0 |  |
Net cash provided by discontinued operations | 0 |  |  |
Cash and cash equivalents, beginning of period | 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 | (628) | 472 |  |
Cash flows from investing activities |  |  |  |
Capital expenditures | 0 | 0 |  |
Net activity with affiliates | 154,344 | 111,053 |  |
Advances pursuant to development agreement |  | 0 |  |
Other investing activities | 0 | 0 |  |
Net cash used in investing activities | 154,344 | 111,053 |  |
Cash flows from financing activities |  |  |  |
Borrowings under bank credit facility | 0 | 0 |  |
Payments under bank credit facility | 0 | 0 |  |
Debt issue costs | 0 | 0 |  |
Net activity with affiliates | (153,716) | (111,525) |  |
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 | (153,716) | (111,525) |  |
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
Net change in cash, cash equivalents and restricted cash | $ 0 | $ 0 |  |

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