Condensed Consolidating Financial Information - Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net Cash Provided by (Used in) Operating Activities	$ 71,167	$ 47,919
Cash flows from investing activities:
Capital expenditures, net of related payables	(23,709)	(20,740)
Proceeds from sale of land, property and equipment	4,964	33
Distributions in excess of earnings from joint ventures	249	0
Distributions from subsidiaries	0	0
Proceeds from repayment of Native American development costs	0	16,974
Proceeds from repayment of advances to subsidiaries, net	0	0
Loans to parent, net	0	0
Native American development costs	(760)	(580)
Investment in subsidiaries	0	0
Other, net	(570)	1,256
Net cash provided by (used in) investing activities	(19,826)	(3,057)
Cash flows from financing activities:
Borrowings under credit agreements with original maturity dates of three months or less, net	20,000	0
Payments under credit agreements with original maturiy dates greater than three months	(65,880)	(4,063)
Distributions to members and noncontrolling interests	(18,877)	(38,564)
Payment of debt issuance costs	0	(2,356)
Payments on derivative instruments with other-than-insignificant financing elements	(2,441)	(2,705)
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	5,129
Other, net	(997)	(567)
Net cash used in financing activities	(68,195)	(43,126)
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	(16,854)	1,736
Balance, beginning of period	122,702	137,621
Balance, end of period	105,848	139,357
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	39,589	42,552
Capital expenditures incurred but not yet paid	12,472	8,573
Parent [Member]
Net Cash Provided by (Used in) Operating Activities	(34,505)	(40,853)
Cash flows from investing activities:
Capital expenditures, net of related payables	(5,540)	(1,873)
Proceeds from sale of land, property and equipment	13	1
Distributions in excess of earnings from joint ventures	0
Distributions from subsidiaries	7,052	5,062
Proceeds from repayment of Native American development costs		0
Proceeds from repayment of advances to subsidiaries, net	44,697	42,809
Loans to parent, net	0	0
Native American development costs	0	0
Investment in subsidiaries	(29)	0
Other, net	10	623
Net cash provided by (used in) investing activities	46,203	46,622
Cash flows from financing activities:
Borrowings under credit agreements with original maturity dates of three months or less, net	20,000
Payments under credit agreements with original maturiy dates greater than three months	(65,090)	(4,063)
Distributions to members and noncontrolling interests	(17,077)	(37,172)
Payment of debt issuance costs		(2,356)
Payments on derivative instruments with other-than-insignificant financing elements	(1,989)	(2,204)
Loans from subsidiaries, net	47,909	45,707
Payments on advances from parent, net	0	0
Capital contributions from members	0	0
Capital contributions from noncontrolling interests		0
Other, net	(500)	(463)
Net cash used in financing activities	(16,747)	(551)
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	(5,049)	5,218
Balance, beginning of period	13,554	27,182
Balance, end of period	8,505	32,400
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	38,230	41,973
Capital expenditures incurred but not yet paid	5,149	0
Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	101,454	89,106
Cash flows from investing activities:
Capital expenditures, net of related payables	(17,857)	(17,922)
Proceeds from sale of land, property and equipment	4,255	32
Distributions in excess of earnings from joint ventures	249
Distributions from subsidiaries	1,800	1,586
Proceeds from repayment of Native American development costs		16,974
Proceeds from repayment of advances to subsidiaries, net	0	0
Loans to parent, net	(47,909)	(45,707)
Native American development costs	(760)	(580)
Investment in subsidiaries	0	(6,871)
Other, net	(551)	646
Net cash provided by (used in) investing activities	(60,773)	(51,842)
Cash flows from financing activities:
Borrowings under credit agreements with original maturity dates of three months or less, net	0
Payments under credit agreements with original maturiy dates greater than three months	0	0
Distributions to members and noncontrolling interests	(7,052)	(5,062)
Payment of debt issuance costs		0
Payments on derivative instruments with other-than-insignificant financing elements	(452)	(501)
Loans from subsidiaries, net	0	0
Payments on advances from parent, net	(44,697)	(42,809)
Capital contributions from members	0	0
Capital contributions from noncontrolling interests		0
Other, net	(497)	(104)
Net cash used in financing activities	(52,698)	(48,476)
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	(12,017)	(11,212)
Balance, beginning of period	104,575	103,584
Balance, end of period	92,558	92,372
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	486	550
Capital expenditures incurred but not yet paid	7,253	8,559
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 sale of land, property and equipment	0	0
Distributions in excess of earnings from joint ventures	0
Distributions from subsidiaries	(7,052)	(5,062)
Proceeds from repayment of Native American development costs		0
Proceeds from repayment of advances to subsidiaries, net	(44,697)	(42,809)
Loans to parent, net	47,909	45,707
Native American development costs	0	0
Investment in subsidiaries	0	0
Other, net	0	0
Net cash provided by (used in) investing activities	(3,840)	(2,164)
Cash flows from financing activities:
Borrowings under credit agreements with original maturity dates of three months or less, net	0
Payments under credit agreements with original maturiy dates greater than three months	0	0
Distributions to members and noncontrolling interests	7,052	5,062
Payment of debt issuance costs		0
Payments on derivative instruments with other-than-insignificant financing elements	0	0
Loans from subsidiaries, net	(47,909)	(45,707)
Payments on advances from parent, net	44,697	42,809
Capital contributions from members	0	0
Capital contributions from noncontrolling interests		0
Other, net	0	0
Net cash used in financing activities	3,840	2,164
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	66,949	48,253
Cash flows from investing activities:
Capital expenditures, net of related payables	(23,397)	(19,795)
Proceeds from sale of land, property and equipment	4,268	33
Distributions in excess of earnings from joint ventures	249
Distributions from subsidiaries	1,800	1,586
Proceeds from repayment of Native American development costs		16,974
Proceeds from repayment of advances to subsidiaries, net	0	0
Loans to parent, net	0	0
Native American development costs	(760)	(580)
Investment in subsidiaries	(29)	(6,871)
Other, net	(541)	1,269
Net cash provided by (used in) investing activities	(18,410)	(7,384)
Cash flows from financing activities:
Borrowings under credit agreements with original maturity dates of three months or less, net	20,000
Payments under credit agreements with original maturiy dates greater than three months	(65,090)	(4,063)
Distributions to members and noncontrolling interests	(17,077)	(37,172)
Payment of debt issuance costs		(2,356)
Payments on derivative instruments with other-than-insignificant financing elements	(2,441)	(2,705)
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	(997)	(567)
Net cash used in financing activities	(65,605)	(46,863)
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	(17,066)	(5,994)
Balance, beginning of period	118,129	130,766
Balance, end of period	101,063	124,772
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	38,716	42,523
Capital expenditures incurred but not yet paid	12,402	8,559
Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	4,218	(334)
Cash flows from investing activities:
Capital expenditures, net of related payables	(312)	(945)
Proceeds from sale of land, property and equipment	696	0
Distributions in excess of earnings from joint ventures	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	(29)	(13)
Net cash provided by (used in) investing activities	355	(958)
Cash flows from financing activities:
Borrowings under credit agreements with original maturity dates of three months or less, net	0
Payments under credit agreements with original maturiy dates greater than three months	(790)	0
Distributions to members and noncontrolling interests	(3,600)	(2,978)
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	6,871
Capital contributions from noncontrolling interests		5,129
Other, net	0	0
Net cash used in financing activities	(4,361)	9,022
Cash and cash equivalents:
Increase (decrease) in cash and cash equivalents	212	7,730
Balance, beginning of period	4,573	6,855
Balance, end of period	4,785	14,585
Supplemental cash flow disclosures:
Cash paid for interest, net of amounts capitalized	873	29
Capital expenditures incurred but not yet paid	70	14
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 sale of land, property and equipment	0	0
Distributions in excess of earnings from joint ventures	0
Distributions from subsidiaries	(1,800)	(1,586)
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	6,871
Other, net	0	0
Net cash provided by (used in) investing activities	(1,771)	5,285
Cash flows from financing activities:
Borrowings under credit agreements with original maturity dates of three months or less, net	0
Payments under credit agreements with original maturiy dates greater than three months	0	0
Distributions to members and noncontrolling interests	1,800	1,586
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)	(6,871)
Capital contributions from noncontrolling interests		0
Other, net	0	0
Net cash used in financing activities	1,771	(5,285)
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