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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Details 4) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net cash provided by continuing operations $ 141,991 $ 67,527
Net cash provided by discontinued operations 2,392 6,772
Net cash provided by operating activities 144,383 74,299
Cash flows from investing activities:    
Capital expenditures (328,725) (171,291)
Proceeds from sale of property, plant and equipment 27,996 37,086
Decrease in restricted cash (163) 819
Return of investments in non-consolidated affiliates 47,084  
Cash invested in non-consolidated affiliates (224) (262)
Net cash used in continuing operations (254,032) (133,648)
Net cash provided by (used in) discontinued operations 121,041 (5,437)
Net cash used in investing activities (132,991) (139,085)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 1,548,000 1,602,867
Repayments of long-term debt (1,630,621) (1,804,578)
Payments for debt issuance costs (549) (8,646)
Net proceeds from the sale of Partnership units 114,530 289,908
Proceeds from stock options exercised 119 526
Proceeds from stock issued pursuant to our employee stock purchase plan 1,280 1,435
Purchases of treasury stock (1,892) (2,456)
Stock-based compensation excess tax benefit 210 836
Distributions to noncontrolling partners in the Partnership (41,975) (27,790)
Net cash provided by (used in) financing activities (10,898) 52,102
Effect of exchange rate changes on cash and cash equivalents (326) (2,458)
Net increase (decrease) in cash and cash equivalents 168 (15,142)
Cash and cash equivalents at beginning of period 21,903 44,361
Cash and cash equivalents at end of period 22,071 29,219
Parent
    
Cash flows from operating activities:    
Net cash provided by continuing operations 2,740 733
Net cash provided by operating activities 2,740 733
Cash flows from investing activities:    
Return on investment in consolidated subsidiaries   87,419
Net cash used in continuing operations   87,419
Net cash used in investing activities   87,419
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 886,000 1,096,240
Repayments of long-term debt (982,150) (1,227,644)
Payments for debt issuance costs   (7,666)
Proceeds from stock options exercised 119 526
Proceeds from stock issued pursuant to our employee stock purchase plan 1,280 1,435
Purchases of treasury stock (1,892) (2,456)
Stock-based compensation excess tax benefit 210 836
Borrowings (repayments) between consolidated subsidiaries, net 93,705 50,428
Net cash provided by (used in) financing activities (2,728) (88,301)
Net increase (decrease) in cash and cash equivalents 12 (149)
Cash and cash equivalents at beginning of period 93 160
Cash and cash equivalents at end of period 105 11
Guarantor Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by continuing operations 21,848 34,416
Net cash provided by operating activities 21,848 34,416
Cash flows from investing activities:    
Capital expenditures (187,882) (103,329)
Contract operations acquisition 77,415 62,217
Proceeds from sale of property, plant and equipment 8,986 10,736
Capital distributions received from consolidated subsidiaries 22,847 23,516
Investment in consolidated subsidiaries (23,483) (28,640)
Net cash used in continuing operations (102,117) (35,500)
Net cash used in investing activities (102,117) (35,500)
Cash flows from financing activities:    
Net proceeds from the sale of Partnership units   162,236
Capital distribution to affiliates   (87,419)
Borrowings (repayments) between consolidated subsidiaries, net 78,120 (73,519)
Net cash provided by (used in) financing activities 78,120 1,298
Net increase (decrease) in cash and cash equivalents (2,149) 214
Cash and cash equivalents at beginning of period 2,810 1,536
Cash and cash equivalents at end of period 661 1,750
Other Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by continuing operations 117,403 32,378
Net cash provided by discontinued operations 2,392 6,772
Net cash provided by operating activities 119,795 39,150
Cash flows from investing activities:    
Capital expenditures (140,843) (67,962)
Contract operations acquisition (77,415) (62,217)
Proceeds from sale of property, plant and equipment 19,010 26,350
Decrease in restricted cash (163) 819
Return of investments in non-consolidated affiliates 47,084  
Cash invested in non-consolidated affiliates (224) (262)
Return on investment in consolidated subsidiaries   87,419
Net cash used in continuing operations (152,551) (15,853)
Net cash provided by (used in) discontinued operations 121,041 (5,437)
Net cash used in investing activities (31,510) (21,290)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 662,000 506,627
Repayments of long-term debt (648,471) (576,934)
Payments for debt issuance costs (549) (980)
Net proceeds from the sale of Partnership units 114,530 127,672
Distributions to noncontrolling partners in the Partnership (64,822) (51,306)
Net proceeds from sale of general partner units 2,426 1,316
Capital distribution to affiliates   (87,419)
Capital contributions received from parent 21,057 27,324
Borrowings (repayments) between consolidated subsidiaries, net (171,825) 23,091
Net cash provided by (used in) financing activities (85,654) (30,609)
Effect of exchange rate changes on cash and cash equivalents (326) (2,458)
Net increase (decrease) in cash and cash equivalents 2,305 (15,207)
Cash and cash equivalents at beginning of period 19,000 42,665
Cash and cash equivalents at end of period 21,305 27,458
Eliminations
    
Cash flows from investing activities:    
Capital distributions received from consolidated subsidiaries (22,847) (23,516)
Investment in consolidated subsidiaries 23,483 28,640
Return on investment in consolidated subsidiaries   (174,838)
Net cash used in continuing operations 636 (169,714)
Net cash used in investing activities 636 (169,714)
Cash flows from financing activities:    
Distributions to noncontrolling partners in the Partnership 22,847 23,516
Net proceeds from sale of general partner units (2,426) (1,316)
Capital distribution to affiliates   174,838
Capital contributions received from parent (21,057) (27,324)
Net cash provided by (used in) financing activities $ (636) $ 169,714