v2.4.0.8
Consolidated And Combined Statements Of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating Activities    
Net income $ 141,404,000 $ 64,510,000
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization 58,502,000 56,800,000
Amortization of deferred major repair costs 813,000 510,000
Deferred and noncurrent income tax charges (credits) (12,472,000) (7,166,000)
Accretion on discounted liabilities 821,000 736,000
Pretax gains from sale of assets (5,980,000) (163,000)
Net decrease in noncash operating working capital 174,971,000 12,763,000
Other operating activities - net 11,897,000 603,000
Net cash provided by operating activities 369,956,000 128,593,000
Investing Activities    
Property additions (122,071,000) (75,469,000)
Proceeds from sale of assets 6,074,000 194,000
Expenditures for major repairs (1,058,000) (859,000)
Net (purchases) maturities of marketable securities (198,152,000)  
Other inventory activities - net 52,000 50,000
Net cash required by investing activities (315,155,000) (76,084,000)
Financing Activities    
Repayments of long-term debt (34,000) (31,000)
Additions to long-term debt 641,250,000  
Cash dividend to former parent (650,000,000)  
Debt issuance costs (6,649,000)  
Net distributions to parent (32,394,000) (25,049,000)
Net cash required by financing activities (47,827,000) (25,080,000)
Net increase in cash and cash equivalents 6,974,000 27,429,000
Cash and cash equivalents at January 1 57,373,000 36,887,000
Cash and cash equivalents at September 30 $ 64,347,000 $ 64,316,000