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SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION (Details 4) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations $ 38,591 $ 25,452
Net cash provided by discontinued operations   662
Net cash provided by operating activities 38,591 26,114
Cash flows from investing activities:    
Capital expenditures (116,720) (51,412)
Proceeds from sale of property, plant and equipment 9,952 27,499
(Increase) decrease in restricted cash (15) 304
Return of investments in non-consolidated affiliates 37,563  
Cash invested in non-consolidated affiliates (224)  
Net cash used in investing activities (69,444) (23,609)
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 844,500 604,981
Repayments of long-term debt (913,048) (766,961)
Payments for debt issue costs (525) (980)
Net proceeds from the sale of Partnership units 114,568 162,236
Proceeds from stock options exercised   239
Proceeds from stock issued pursuant to our employee stock purchase plan 405 478
Purchases of treasury stock (1,757) (2,366)
Stock-based compensation excess tax benefit 194 869
Distributions to noncontrolling partners in the Partnership (12,207) (6,468)
Net cash provided by (used in) financing activities 32,130 (7,972)
Effect of exchange rate changes on cash and cash equivalents 243 (1,364)
Net increase (decrease) in cash and cash equivalents 1,520 (6,831)
Cash and cash equivalents at beginning of period 22,039 44,616
Cash and cash equivalents at end of period 23,559 37,785
Parent
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations   2,063
Net cash provided by operating activities 1,863 2,063
Cash flows from investing activities:    
Return on investment in consolidated subsidiaries   53,966
Net cash used in investing activities   53,966
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 279,500 304,766
Repayments of long-term debt (438,000) (461,961)
Proceeds from stock options exercised   239
Proceeds from stock issued pursuant to our employee stock purchase plan 405 478
Purchases of treasury stock (1,757) (2,366)
Stock-based compensation excess tax benefit 194 869
Borrowings (repayments) between consolidated subsidiaries, net 157,973 101,819
Net cash provided by (used in) financing activities (1,685) (56,156)
Net increase (decrease) in cash and cash equivalents 178 (127)
Cash and cash equivalents at beginning of period 93 160
Cash and cash equivalents at end of period 271 33
Subsidiary Issuer
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations   (68)
Net cash provided by operating activities 31 (68)
Cash flows from investing activities:    
Return on investment in consolidated subsidiaries   87,419
Net cash used in investing activities   87,419
Cash flows from financing activities:    
Capital distribution to consolidated subsidiaries   (53,966)
Borrowings (repayments) between consolidated subsidiaries, net (31) (33,385)
Net cash provided by (used in) financing activities (31) (87,351)
Guarantor Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations   (19,477)
Net cash provided by operating activities (13,853) (19,477)
Cash flows from investing activities:    
Capital expenditures (68,191) (28,734)
Contract operations acquisition 77,415  
Proceeds from sale of property, plant and equipment 4,094 3,999
Capital contributions received from consolidated subsidiaries 7,373 9,535
Investment in consolidated subsidiaries (10,231) (9,129)
Net cash used in investing activities 10,460 (24,329)
Cash flows from financing activities:    
Net proceeds from the sale of Partnership units   162,236
Capital distribution to consolidated subsidiaries   (87,419)
Borrowings (repayments) between consolidated subsidiaries, net 1,691 (30,845)
Net cash provided by (used in) financing activities 1,691 43,972
Net increase (decrease) in cash and cash equivalents (1,702) 166
Cash and cash equivalents at beginning of period 2,820 1,586
Cash and cash equivalents at end of period 1,118 1,752
Other Subsidiaries
    
Cash flows from operating activities:    
Net cash provided by (used in) continuing operations   42,934
Net cash provided by discontinued operations   662
Net cash provided by operating activities 50,550 43,596
Cash flows from investing activities:    
Capital expenditures (48,529) (22,678)
Contract operations acquisition (77,415)  
Proceeds from sale of property, plant and equipment 5,858 23,500
(Increase) decrease in restricted cash (15) 304
Capital contributions received from consolidated subsidiaries 7,805 9,129
Return of investments in non-consolidated affiliates 37,563  
Return on investment in consolidated subsidiaries   87,419
Cash invested in non-consolidated affiliates (224)  
Net cash used in investing activities (74,957) 97,674
Cash flows from financing activities:    
Proceeds from borrowings of long-term debt 565,000 300,215
Repayments of long-term debt (475,048) (305,000)
Payments for debt issue costs (525) (980)
Net proceeds from the sale of Partnership units 114,568  
Distributions to noncontrolling partners in the Partnership (19,580) (16,003)
Net proceeds from the sale of general partner units 2,426  
Capital distribution to consolidated subsidiaries   (87,419)
Borrowings (repayments) between consolidated subsidiaries, net (159,633) (37,589)
Net cash provided by (used in) financing activities 27,208 (146,776)
Effect of exchange rate changes on cash and cash equivalents 243 (1,364)
Net increase (decrease) in cash and cash equivalents 3,044 (6,870)
Cash and cash equivalents at beginning of period 19,126 42,870
Cash and cash equivalents at end of period 22,170 36,000
Eliminations
    
Cash flows from investing activities:    
Capital contributions received from consolidated subsidiaries (15,178) (18,664)
Return on investment in consolidated subsidiaries   (228,804)
Investment in consolidated subsidiaries 10,231 9,129
Net cash used in investing activities (4,947) (238,339)
Cash flows from financing activities:    
Distributions to noncontrolling partners in the Partnership 7,373 9,535
Net proceeds from the sale of general partner units (2,426)  
Capital distribution to consolidated subsidiaries   228,804
Net cash provided by (used in) financing activities $ 4,947 $ 238,339