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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Cash Flows from Operating Activities: |  |
Net income | $ 90,086 | $ 62,294
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation, depletion, and amortization of intangibles and deferred financing costs | 86,040 | 44,296
Share-based compensation expense | 3,588 | 3,637
Deferred income tax provision | 15,645 | 196
Alternative energy tax credits | 0 | 6,929
Pension and postretirement benefits expense, net of contributions | 6,155 | 10,120
Other, net | 2,788 | 2,970
Increase in assets - |  |
Accounts receivable | (43,429) | (39,541)
Inventories | (13,035) | (4,168)
Prepaid expenses and other current assets | (8,677) | (3,863)
Increase (decrease) in liabilities - |  |
Accounts payable | 4,255 | 23,537
Accrued liabilities | 5,883 | (10,640)
Net cash provided by operating activities | 149,299 | 95,767
Cash Flows from Investing Activities: |  |
Additions to property, plant, and equipment | (50,933) | (27,276)
Additions to other long term assets | (2,746) | (1,730)
Other | 77 | 46
Net cash used for investing activities | (53,602) | (28,960)
Cash Flows from Financing Activities: |  |
Repayments of debt and capital lease obligations | (66,251) | (3,985)
Common stock dividends paid | (39,297) | 0
Repurchases of common stock | 0 | (3,340)
Proceeds from exercise of stock options | 3,348 | 1,707
Excess tax benefits from share-based awards | 3,659 | 763
Shares withheld to cover employee restricted stock taxes | (2,395) | (1,308)
Other | (15) | 0
Net cash used for financing activities | (100,951) | (6,163)
Net increase (decrease) in cash and cash equivalents | (5,254) | 60,644
Cash and cash equivalents, beginning of period | 190,960 | 207,393
Cash and cash equivalents, end of period | $ 185,706 | $ 268,037

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X
- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration