Condensed Consolidating Guarantor Financial Statements - Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 72,489	$ 58,096	$ 315,525	$ 40,598
Restricted cash	0	32
Accounts receivable, net	288,838	326,713
Receivable from affiliates	3,677	5,914
Inventories	65,344	70,239
Other current assets	18,754	19,387
Total current assets	449,102	480,381
Property, plant and equipment, net	1,629,751	1,566,821
Equity method investments	503,914	551,078
Goodwill	35,008	48,032
Other intangible assets, net	159,496	162,223
Other noncurrent assets	24,561	45,374
Total assets	2,801,832	2,853,909
Current liabilities:
Accounts Payable	215,751	273,666
Due to Related Parties	3,407	5,033
Accrued Liabilities	85,688	85,047
Deferred revenue	11,880	13,281
Total current liabilities	316,726	377,027
Long-term debt, net	1,122,588	1,057,816
Deferred income taxes	180,599	200,953
Other noncurrent liabilities	$ 23,551	$ 21,757
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	$ 1,078,834	$ 1,115,527
Noncontrolling interests in consolidated subsidiaries	79,534	80,829
Total owners’ equity	1,158,368	1,196,356
Total liabilities and owners’ equity	2,801,832	2,853,909
Parent Company [Member]
Current assets:
Cash and cash equivalents	2,608	4,559	252,412	9,254
Restricted cash		0
Accounts receivable, net	703	640
Receivable from affiliates	2,209	1,616
Inventories	0	0
Other current assets	8,323	8,477
Total current assets	13,843	15,292
Property, plant and equipment, net	4,474	4,335
Equity method investments	1,553,273	1,546,853
Goodwill	0	0
Other intangible assets, net	19	20
Other noncurrent assets	18,761	39,358
Total assets	1,590,370	1,605,858
Current liabilities:
Accounts Payable	255	734
Due to Related Parties	73	78
Accrued Liabilities	10,370	5,551
Deferred revenue	321	569
Total current liabilities	11,019	6,932
Long-term debt, net	365,667	325,460
Deferred income taxes	132,249	155,411
Other noncurrent liabilities	$ 2,601	$ 2,528
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	$ 1,078,834	$ 1,115,527
Noncontrolling interests in consolidated subsidiaries	0	0
Total owners’ equity	1,078,834	1,115,527
Total liabilities and owners’ equity	1,590,370	1,605,858
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	0	0	0	0
Restricted cash		0
Accounts receivable, net	14,561	20,015
Receivable from affiliates	881	1,119
Inventories	122	(48)
Other current assets	161	359
Total current assets	15,725	21,445
Property, plant and equipment, net	539,195	536,628
Equity method investments	495,139	426,801
Goodwill	0	13,052
Other intangible assets, net	142,133	144,183
Other noncurrent assets	813	881
Total assets	1,193,005	1,142,990
Current liabilities:
Accounts Payable	9,587	11,221
Due to Related Parties	25	155
Accrued Liabilities	13,341	10,957
Deferred revenue	0	0
Total current liabilities	22,953	22,333
Long-term debt, net	7,125	7,340
Deferred income taxes	0	0
Other noncurrent liabilities	$ 0	$ 0
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	$ 1,162,927	$ 1,113,317
Noncontrolling interests in consolidated subsidiaries	0	0
Total owners’ equity	1,162,927	1,113,317
Total liabilities and owners’ equity	1,193,005	1,142,990
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	71,969	55,101	66,021	35,445
Restricted cash		32
Accounts receivable, net	273,574	306,058
Receivable from affiliates	3,742	6,141
Inventories	65,222	70,287
Other current assets	10,270	10,551
Total current assets	424,777	448,170
Property, plant and equipment, net	1,086,082	1,025,858
Equity method investments	433,574	438,291
Goodwill	35,008	34,980
Other intangible assets, net	17,344	18,020
Other noncurrent assets	4,987	5,135
Total assets	2,001,772	1,970,454
Current liabilities:
Accounts Payable	205,909	261,711
Due to Related Parties	6,464	7,762
Accrued Liabilities	61,976	68,534
Deferred revenue	11,559	12,712
Total current liabilities	285,908	350,719
Long-term debt, net	773,421	748,856
Deferred income taxes	48,350	45,542
Other noncurrent liabilities	$ 20,950	$ 19,229
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	$ 793,609	$ 725,279
Noncontrolling interests in consolidated subsidiaries	79,534	80,829
Total owners’ equity	873,143	806,108
Total liabilities and owners’ equity	2,001,772	1,970,454
Consolidation, Eliminations [Member]
Current assets:
Cash and cash equivalents	(2,088)	(1,564)	$ (2,908)	$ (4,101)
Restricted cash		0
Accounts receivable, net	0	0
Receivable from affiliates	(3,155)	(2,962)
Inventories	0	0
Other current assets	0	0
Total current assets	(5,243)	(4,526)
Property, plant and equipment, net	0	0
Equity method investments	(1,978,072)	(1,860,867)
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets	0	0
Total assets	(1,983,315)	(1,865,393)
Current liabilities:
Accounts Payable	0	0
Due to Related Parties	(3,155)	(2,962)
Accrued Liabilities	1	5
Deferred revenue	0	0
Total current liabilities	(3,154)	(2,957)
Long-term debt, net	(23,625)	(23,840)
Deferred income taxes	0	0
Other noncurrent liabilities	$ 0	$ 0
Commitments and contingencies
Owners’ equity excluding noncontrolling interests in consolidated subsidiaries	$ (1,956,536)	$ (1,838,596)
Noncontrolling interests in consolidated subsidiaries	0	0
Total owners’ equity	(1,956,536)	(1,838,596)
Total liabilities and owners’ equity	$ (1,983,315)	$ (1,865,393)