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Consolidated and Combined Statements of Cash Flows
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Operating Activities      
Net income $ 176,340 $ 243,863 $ 235,033
Adjustments to reconcile net income to net cash provided by operating activities      
(Income) loss from discontinued operations, net of taxes (38,749) (20,903) (80,898)
Depreciation and amortization 86,568 79,087 74,053
Deferred and noncurrent income tax charges (credits) 40,556 (4,403) (11,568)
Accretion on discounted liabilities 1,521 1,200 1,096
Pretax (gains) losses from sale of assets 4,658 (194) (5,995)
Net decrease (increase) in noncash operating working capital (46,586) (36,475) 51,204
Other operating activities - net 9,417 14,531 13,215
Net cash provided by (used in) continuing operations 233,725 276,706 276,140
Net cash provided by (used in) discontinued operations (17,887) 28,876 80,558
Net cash provided by operating activities 215,838 305,582 356,698
Investing Activities      
Property additions (205,225) (135,339) (163,303)
Proceeds from sale of assets 729 376 6,113
Changes in restricted cash (68,571) 0 0
Other investing activities - net (2,889) (10,631) 52
Investing activities of discontinued operations      
Sales proceeds 93,765 1,097 173,118
Other (7,443) (4,918) (3,088)
Net cash provided by (required by) investing activities (189,634) (149,415) 12,892
Financing Activities      
Purchase of treasury stock (248,695) (51,348) 0
Repayments of long-term debt (146) (70,000) (81,170)
Additions to long-term debt 0 0 641,250
Cash dividend to former parent 0 0 (650,000)
Debt issuance costs (58) (875) (6,693)
Amounts related to share-based compensation (3,075) (580) 0
Net distributions to former parent 0 0 (35,609)
Net cash required by financing activities (251,974) (122,803) (132,222)
Net increase in cash and cash equivalents (225,770) 33,364 237,368
Cash and cash equivalents at January 1 328,105 294,741 57,373
Cash and cash equivalents at December 31 102,335 328,105 294,741
Less: Cash and cash equivalents held for sale 0 942 0
Cash and cash equivalents of continuing operations at December 31 $ 102,335 $ 327,163 $ 294,741