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