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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Cash Flows from Operating Activities: |  |
Net income | $ 189,643 | $ 128,546
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation, depletion, and amortization of intangibles and deferred financing costs | 189,120 | 88,979
Share-based compensation expense | 7,601 | 6,774
Deferred income tax provision (benefit) | 19,583 | (6,786)
Alternative energy tax credits | 0 | 72,437
Pension and postretirement benefits expense, net of contributions | 12,657 | 28,023
Other, net | (102) | 2,494
(Increase) decrease in assets - |  |
Accounts receivable | (47,640) | (51,225)
Inventories | (13,277) | 78
Prepaid expenses and other current assets | (27,497) | (15,695)
Federal and state income tax receivable | 20,088 | (11,656)
Increase (decrease) in liabilities - |  |
Accounts payable | (6,258) | 47,400
Accrued liabilities | (9,775) | (6,332)
Net cash provided by operating activities | 334,143 | 283,037
Cash Flows from Investing Activities: |  |
Additions to property, plant, and equipment | (148,183) | (80,891)
Acquisition of business, net of cash acquired | (20,290) | 0
Additions to other long term assets | (5,949) | (2,196)
Other | 3,111 | 234
Net cash used for investing activities | (171,311) | (82,853)
Cash Flows from Financing Activities: |  |
Repayments of debt and capital lease obligations | (116,506) | (7,974)
Common stock dividends paid | (78,645) | (30,658)
Repurchases of common stock | 0 | (5,149)
Proceeds from exercise of stock options | 3,739 | 2,125
Excess tax benefits from stock-based awards | 11,569 | 5,444
Shares withheld to cover employee restricted stock taxes | (11,759) | (1,308)
Other | (199) | 0
Net cash used for financing activities | (191,801) | (37,520)
Net (decrease) increase in cash and cash equivalents | (28,969) | 162,664
Cash and cash equivalents, beginning of period | 190,960 | 207,393
Cash and cash equivalents, end of period | $ 161,991 | $ 370,057

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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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