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Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Cash provided by (used in) operating activities $ 54,990 $ 86,145  
Investing Activities      
Change in restricted cash 1,455    
Capital expenditures (93,271) (38,711)  
Proceeds from dispositions of property, plant and equipment 22,105 516  
Purchases of investments and advances to affiliates (5,777) (34,419)  
Additions to prepaid royalties (8,262) (20,915)  
Cash used in investing activities (83,750) (93,529)  
Financing Activities      
Payments to retire debt (1,330)    
Net increase (decrease) in borrowings under lines of credit and commercial paper program 34,000 3,681  
Net proceeds on other debt (5,993) (5,161)  
Debt financing costs (100) (8)  
Dividends paid (23,327) (16,269)  
Issuance of common stock under incentive plans 5,131 768  
Cash provided by (used in) financing activities 8,381 (16,989)  
Increase (decrease) in cash and cash equivalents (20,379) (24,373) (20,379)
Cash and cash equivalents, beginning of period 138,149 93,593 93,593
Cash and cash equivalents, end of period 117,770 69,220 138,149
Parent/Issuer [Member]
     
Cash provided by (used in) operating activities (18,535) (75,477)  
Investing Activities      
Change in restricted cash 1,455    
Capital expenditures (1,177) (900)  
Purchases of investments and advances to affiliates (3,619) (9,529)  
Cash used in investing activities (3,341) (10,429)  
Financing Activities      
Net increase (decrease) in borrowings under lines of credit and commercial paper program 34,000    
Net proceeds on other debt (5,993) (5,161)  
Debt financing costs (54)    
Dividends paid (23,327) (16,269)  
Issuance of common stock under incentive plans 5,131 768  
Transactions with affiliates, net (14,060) 95,911  
Cash provided by (used in) financing activities   75,249  
Increase (decrease) in cash and cash equivalents   (10,657) (26,179)
Cash and cash equivalents, beginning of period 61,375 13,713 13,713
Cash and cash equivalents, end of period 35,196 3,056 61,375
Guarantor Subsidiaries [Member]
     
Cash provided by (used in) operating activities 34,078 144,796  
Investing Activities      
Capital expenditures (73,657) (23,615)  
Proceeds from dispositions of property, plant and equipment 546 502  
Purchases of investments and advances to affiliates (3,488) (24,890)  
Additions to prepaid royalties (4,818) (20,915)  
Cash used in investing activities (81,417) (68,918)  
Financing Activities      
Contributions from parent 1,330    
Payments to retire debt (1,330)    
Transactions with affiliates, net 47,315 (75,893)  
Cash provided by (used in) financing activities   (75,893)  
Increase (decrease) in cash and cash equivalents   (15) (24)
Cash and cash equivalents, beginning of period 332 64 64
Cash and cash equivalents, end of period 308 49 332
Non-Guarantor Subsidiaries [Member]
     
Cash provided by (used in) operating activities 39,447 16,826  
Investing Activities      
Capital expenditures (18,437) (14,196)  
Proceeds from dispositions of property, plant and equipment 21,559 14  
Additions to prepaid royalties (3,444)    
Cash used in investing activities (322) (14,182)  
Financing Activities      
Net increase (decrease) in borrowings under lines of credit and commercial paper program   3,681  
Debt financing costs (46) (8)  
Transactions with affiliates, net (33,255) (20,018)  
Cash provided by (used in) financing activities   (16,345)  
Increase (decrease) in cash and cash equivalents   (13,701) 5,824
Cash and cash equivalents, beginning of period 76,442 79,816 79,816
Cash and cash equivalents, end of period 82,266 66,115 76,442
Eliminations [Member]
     
Investing Activities      
Purchases of investments and advances to affiliates 1,330    
Cash used in investing activities 1,330    
Financing Activities      
Contributions from parent $ (1,330)