Condensed Consolidating Guarantor Financial Statements - Balance Sheets (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 315,525,000	$ 40,598,000	$ 74,958,000	$ 79,351,000
Restricted cash	6,396,000	6,980,000
Accounts receivable, net	290,353,000	351,334,000
Receivable from affiliates	15,156,000	16,819,000
Inventories	67,770,000	43,532,000
Other current assets	15,770,000	20,017,000
Total current assets	710,970,000	479,280,000
Property, plant and equipment, net	1,303,781,000	1,256,825,000
Equity method investments	561,463,000	577,920,000
Goodwill	58,159,000	58,326,000
Other intangible assets, net	170,362,000	173,065,000
Other noncurrent assets, net	56,805,000	44,386,000
Total assets	2,861,540,000	2,589,802,000
Current liabilities:
Accounts payable	222,712,000	257,177,000
Payable to affiliates	16,188,000	13,460,000
Accrued liabilities	83,473,000	92,694,000
Payables to pre-petition creditors	3,130,000	3,129,000
Deferred revenue	20,602,000	23,688,000
Other current liabilities	3,236,000	1,474,000
Current portion of long-term debt	47,000	40,000
Total current liabilities	349,388,000	391,662,000
Long-term debt	1,027,072,000	767,092,000
Deferred income taxes	175,562,000	161,956,000
Other noncurrent liabilities	47,576,000	49,655,000
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	1,158,735,000	1,149,508,000
Noncontrolling interests in consolidated subsidiaries	103,207,000	69,929,000
Total owners’ equity	1,261,942,000	1,219,437,000
Total liabilities and owners’ equity	2,861,540,000	2,589,802,000
Parent Company [Member]
Current assets:
Cash and cash equivalents	252,412,000	9,254,000	4,491,000	2,545,000
Restricted cash	3,832,000	3,856,000
Accounts receivable, net	741,000	9,669,000
Receivable from affiliates	959,000	2,512,000
Inventories	0	0
Other current assets	7,359,000	10,498,000
Total current assets	265,303,000	35,789,000
Property, plant and equipment, net	4,589,000	4,112,000
Equity method investments	1,366,535,000	1,551,825,000
Goodwill	0	0
Other intangible assets, net	24,000	26,000
Other noncurrent assets, net	37,443,000	24,555,000
Total assets	1,673,894,000	1,616,307,000
Current liabilities:
Accounts payable	203,000	649,000
Payable to affiliates	17,000	21,000
Accrued liabilities	10,774,000	11,993,000
Payables to pre-petition creditors	3,130,000	3,129,000
Deferred revenue	0	0
Other current liabilities	1,249,000	224,000
Current portion of long-term debt	0	0
Total current liabilities	15,373,000	16,016,000
Long-term debt	366,000,000	335,000,000
Deferred income taxes	130,818,000	112,897,000
Other noncurrent liabilities	2,968,000	2,886,000
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	1,158,735,000	1,149,508,000
Noncontrolling interests in consolidated subsidiaries	0	0
Total owners’ equity	1,158,735,000	1,149,508,000
Total liabilities and owners’ equity	1,673,894,000	1,616,307,000
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	0	0	0	0
Restricted cash	0	0
Accounts receivable, net	31,732,000	32,056,000
Receivable from affiliates	3,339,000	6,624,000
Inventories	254,000	248,000
Other current assets	82,000	575,000
Total current assets	35,407,000	39,503,000
Property, plant and equipment, net	480,959,000	452,352,000
Equity method investments	563,003,000	546,833,000
Goodwill	13,052,000	13,052,000
Other intangible assets, net	150,333,000	152,383,000
Other noncurrent assets, net	1,617,000	958,000
Total assets	1,244,371,000	1,205,081,000
Current liabilities:
Accounts payable	17,796,000	22,097,000
Payable to affiliates	2,000	7,000
Accrued liabilities	13,330,000	17,575,000
Payables to pre-petition creditors	0	0
Deferred revenue	0	0
Other current liabilities	704,000	707,000
Current portion of long-term debt	0	0
Total current liabilities	31,832,000	40,386,000
Long-term debt	0	0
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	1,212,539,000	1,164,695,000
Noncontrolling interests in consolidated subsidiaries	0	0
Total owners’ equity	1,212,539,000	1,164,695,000
Total liabilities and owners’ equity	1,244,371,000	1,205,081,000
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	66,021,000	35,445,000	72,244,000	78,342,000
Restricted cash	2,564,000	3,124,000
Accounts receivable, net	257,880,000	309,609,000
Receivable from affiliates	13,969,000	15,659,000
Inventories	67,516,000	43,284,000
Other current assets	8,329,000	8,944,000
Total current assets	416,279,000	416,065,000
Property, plant and equipment, net	818,233,000	800,361,000
Equity method investments	425,655,000	415,673,000
Goodwill	45,107,000	45,274,000
Other intangible assets, net	20,005,000	20,656,000
Other noncurrent assets, net	17,745,000	18,873,000
Total assets	1,743,024,000	1,716,902,000
Current liabilities:
Accounts payable	204,713,000	234,431,000
Payable to affiliates	19,279,000	21,406,000
Accrued liabilities	59,369,000	63,126,000
Payables to pre-petition creditors	0	0
Deferred revenue	20,602,000	23,688,000
Other current liabilities	1,283,000	543,000
Current portion of long-term debt	47,000	40,000
Total current liabilities	305,293,000	343,234,000
Long-term debt	716,647,000	490,946,000
Deferred income taxes	44,744,000	49,059,000
Other noncurrent liabilities	44,608,000	46,769,000
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	528,525,000	716,965,000
Noncontrolling interests in consolidated subsidiaries	103,207,000	69,929,000
Total owners’ equity	631,732,000	786,894,000
Total liabilities and owners’ equity	1,743,024,000	1,716,902,000
Consolidation, Eliminations [Member]
Current assets:
Cash and cash equivalents	(2,908,000)	(4,101,000)	(1,777,000)	(1,536,000)
Restricted cash	0	0
Accounts receivable, net	0	0
Receivable from affiliates	(3,111,000)	(7,976,000)
Inventories	0	0
Other current assets	0	0
Total current assets	(6,019,000)	(12,077,000)
Property, plant and equipment, net	0	0
Equity method investments	(1,793,730,000)	(1,936,411,000)
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	0	0
Total assets	(1,799,749,000)	(1,948,488,000)
Current liabilities:
Accounts payable	0	0
Payable to affiliates	(3,110,000)	(7,974,000)
Accrued liabilities	0	0
Payables to pre-petition creditors	0	0
Deferred revenue	0	0
Other current liabilities	0	0
Current portion of long-term debt	0	0
Total current liabilities	(3,110,000)	(7,974,000)
Long-term debt	(55,575,000)	(58,854,000)
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	(1,741,064,000)	(1,881,660,000)
Noncontrolling interests in consolidated subsidiaries	0	0
Total owners’ equity	(1,741,064,000)	(1,881,660,000)
Total liabilities and owners’ equity	$ (1,799,749,000)	$ (1,948,488,000)