Condensed Consolidating Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Net Cash Provided by (Used in) Operating Activities	$ 225,937	$ 170,111
Cash flows from investing activities:
Capital expenditures, net of related payables	(74,376)	(71,526)
Proceeds from asset sales	25,156	791
Investments in joint ventures	(41)	(4,386)
Distributions in excess of earnings from joint ventures	845	785
Distributions from subsidiaries	0	0
Proceeds from repayment of Native American development costs	0	66,048
Proceeds from repayment of advances to subsidiaries, net	0	0
Loans to parent, net	0	0
Native American development costs	(1,569)	(2,052)
Investment in subsidiaries	0	0
Other, net	(1,882)	409
Net cash (used in) provided by investing activities	(51,867)	(9,931)
Cash flows from financing activities:
Borrowings under credit agreements with original maturities of three months or less, net	45,000	0
Payments under credit agreements with original maturities greater than three months	(75,768)	(63,218)
Distributions to members and noncontrolling interests	(155,139)	(125,803)
Payment of debt issuance costs	0	(2,454)
Payments on derivative instruments with other-than-insignificant financing elements	(7,125)	(8,270)
Loans from subsidiaries, net	0	0
Payments on advances from parent, net	0	0
Capital contributions from members	0	0
Capital contributions from noncontrolling interests	0	9,803
Other, net	(6,600)	(2,759)
Net cash used in financing activities	(199,632)	(192,701)
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	(25,562)	(32,521)
Balance, beginning of period	122,702	137,621
Balance, end of period	97,140	105,100
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	100,617	103,461
Capital expenditures incurred but not yet paid	20,081	23,339
Parent [Member]
Net Cash Provided by (Used in) Operating Activities	(91,553)	(98,334)
Cash flows from investing activities:
Capital expenditures, net of related payables	(17,985)	(21,148)
Proceeds from asset sales	13	19
Investments in joint ventures	0	0
Distributions in excess of earnings from joint ventures	0	0
Distributions from subsidiaries	20,949	15,380
Proceeds from repayment of Native American development costs		0
Proceeds from repayment of advances to subsidiaries, net	142,543	141,155
Loans to parent, net	0	0
Native American development costs	0	0
Investment in subsidiaries	(29)	(4,359)
Other, net	(876)	638
Net cash (used in) provided by investing activities	144,615	131,685
Cash flows from financing activities:
Borrowings under credit agreements with original maturities of three months or less, net	45,000
Payments under credit agreements with original maturities greater than three months	(73,215)	(62,859)
Distributions to members and noncontrolling interests	(145,700)	(117,729)
Payment of debt issuance costs		(2,454)
Payments on derivative instruments with other-than-insignificant financing elements	(6,049)	(6,740)
Loans from subsidiaries, net	121,519	134,808
Payments on advances from parent, net	0	0
Capital contributions from members	0	0
Capital contributions from noncontrolling interests		0
Other, net	(4,738)	(1,418)
Net cash used in financing activities	(63,183)	(56,392)
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	(10,121)	(23,041)
Balance, beginning of period	13,554	27,182
Balance, end of period	3,433	4,141
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	96,423	101,629
Capital expenditures incurred but not yet paid	8,754	4,268
Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	296,123	269,092
Cash flows from investing activities:
Capital expenditures, net of related payables	(55,691)	(47,503)
Proceeds from asset sales	24,446	772
Investments in joint ventures	(12)	(27)
Distributions in excess of earnings from joint ventures	845	785
Distributions from subsidiaries	9,690	8,075
Proceeds from repayment of Native American development costs		66,048
Proceeds from repayment of advances to subsidiaries, net	0	0
Loans to parent, net	(121,519)	(134,808)
Native American development costs	(1,569)	(2,052)
Investment in subsidiaries	0	(13,197)
Other, net	(978)	(229)
Net cash (used in) provided by investing activities	(144,788)	(122,136)
Cash flows from financing activities:
Borrowings under credit agreements with original maturities of three months or less, net	0
Payments under credit agreements with original maturities greater than three months	0	0
Distributions to members and noncontrolling interests	(20,949)	(15,380)
Payment of debt issuance costs		0
Payments on derivative instruments with other-than-insignificant financing elements	(1,076)	(1,530)
Loans from subsidiaries, net	0	0
Payments on advances from parent, net	(142,543)	(141,155)
Capital contributions from members	0	0
Capital contributions from noncontrolling interests		0
Other, net	(1,862)	(1,339)
Net cash used in financing activities	(166,430)	(159,404)
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	(15,095)	(12,448)
Balance, beginning of period	104,575	103,584
Balance, end of period	89,480	91,136
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	1,264	1,757
Capital expenditures incurred but not yet paid	11,244	18,952
Parent and Guarantor Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities	0	0
Cash flows from investing activities:
Capital expenditures, net of related payables	0	0
Proceeds from asset sales	0	0
Investments in joint ventures	0	0
Distributions in excess of earnings from joint ventures	0	0
Distributions from subsidiaries	(20,949)	(15,380)
Proceeds from repayment of Native American development costs		0
Proceeds from repayment of advances to subsidiaries, net	(142,543)	(141,155)
Loans to parent, net	121,519	134,808
Native American development costs	0	0
Investment in subsidiaries	0	0
Other, net	0	0
Net cash (used in) provided by investing activities	(41,973)	(21,727)
Cash flows from financing activities:
Borrowings under credit agreements with original maturities of three months or less, net	0
Payments under credit agreements with original maturities greater than three months	0	0
Distributions to members and noncontrolling interests	20,949	15,380
Payment of debt issuance costs		0
Payments on derivative instruments with other-than-insignificant financing elements	0	0
Loans from subsidiaries, net	(121,519)	(134,808)
Payments on advances from parent, net	142,543	141,155
Capital contributions from members	0	0
Capital contributions from noncontrolling interests		0
Other, net	0	0
Net cash used in financing activities	41,973	21,727
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	0	0
Balance, beginning of period	0	0
Balance, end of period	0	0
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	0	0
Capital expenditures incurred but not yet paid	0	0
Parent and Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	204,570	170,758
Cash flows from investing activities:
Capital expenditures, net of related payables	(73,676)	(68,651)
Proceeds from asset sales	24,459	791
Investments in joint ventures	(12)	(27)
Distributions in excess of earnings from joint ventures	845	785
Distributions from subsidiaries	9,690	8,075
Proceeds from repayment of Native American development costs		66,048
Proceeds from repayment of advances to subsidiaries, net	0	0
Loans to parent, net	0	0
Native American development costs	(1,569)	(2,052)
Investment in subsidiaries	(29)	(17,556)
Other, net	(1,854)	409
Net cash (used in) provided by investing activities	(42,146)	(12,178)
Cash flows from financing activities:
Borrowings under credit agreements with original maturities of three months or less, net	45,000
Payments under credit agreements with original maturities greater than three months	(73,215)	(62,859)
Distributions to members and noncontrolling interests	(145,700)	(117,729)
Payment of debt issuance costs		(2,454)
Payments on derivative instruments with other-than-insignificant financing elements	(7,125)	(8,270)
Loans from subsidiaries, net	0	0
Payments on advances from parent, net	0	0
Capital contributions from members	0	0
Capital contributions from noncontrolling interests		0
Other, net	(6,600)	(2,757)
Net cash used in financing activities	(187,640)	(194,069)
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	(25,216)	(35,489)
Balance, beginning of period	118,129	130,766
Balance, end of period	92,913	95,277
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	97,687	103,386
Capital expenditures incurred but not yet paid	19,998	23,220
Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	21,367	(647)
Cash flows from investing activities:
Capital expenditures, net of related payables	(700)	(2,875)
Proceeds from asset sales	697	0
Investments in joint ventures	(29)	(4,359)
Distributions in excess of earnings from joint ventures	0	0
Distributions from subsidiaries	0	0
Proceeds from repayment of Native American development costs		0
Proceeds from repayment of advances to subsidiaries, net	0	0
Loans to parent, net	0	0
Native American development costs	0	0
Investment in subsidiaries	0	0
Other, net	(28)	0
Net cash (used in) provided by investing activities	(60)	(7,234)
Cash flows from financing activities:
Borrowings under credit agreements with original maturities of three months or less, net	0
Payments under credit agreements with original maturities greater than three months	(2,553)	(359)
Distributions to members and noncontrolling interests	(19,129)	(16,149)
Payment of debt issuance costs		0
Payments on derivative instruments with other-than-insignificant financing elements	0	0
Loans from subsidiaries, net	0	0
Payments on advances from parent, net	0	0
Capital contributions from members	29	17,556
Capital contributions from noncontrolling interests		9,803
Other, net	0	(2)
Net cash used in financing activities	(21,653)	10,849
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	(346)	2,968
Balance, beginning of period	4,573	6,855
Balance, end of period	4,227	9,823
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	2,930	75
Capital expenditures incurred but not yet paid	83	119
Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities	0	0
Cash flows from investing activities:
Capital expenditures, net of related payables	0	0
Proceeds from asset sales	0	0
Investments in joint ventures	0	0
Distributions in excess of earnings from joint ventures	0	0
Distributions from subsidiaries	(9,690)	(8,075)
Proceeds from repayment of Native American development costs		0
Proceeds from repayment of advances to subsidiaries, net	0	0
Loans to parent, net	0	0
Native American development costs	0	0
Investment in subsidiaries	29	17,556
Other, net	0	0
Net cash (used in) provided by investing activities	(9,661)	9,481
Cash flows from financing activities:
Borrowings under credit agreements with original maturities of three months or less, net	0
Payments under credit agreements with original maturities greater than three months	0	0
Distributions to members and noncontrolling interests	9,690	8,075
Payment of debt issuance costs		0
Payments on derivative instruments with other-than-insignificant financing elements	0	0
Loans from subsidiaries, net	0	0
Payments on advances from parent, net	0	0
Capital contributions from members	(29)	(17,556)
Capital contributions from noncontrolling interests		0
Other, net	0	0
Net cash used in financing activities	9,661	(9,481)
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	0	0
Balance, beginning of period	0	0
Balance, end of period	0	0
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	0	0
Capital expenditures incurred but not yet paid	$ 0	$ 0