Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows from Operating Activities:
Net income	$ 294,088	$ 213,228
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization of intangibles and deferred financing costs	296,486	137,412
Share-based compensation expense	11,648	9,956
Deferred income tax provision	17,427	6,137
Alternative energy tax credits	0	76,280
Pension and postretirement benefits expense, net of contributions	19,230	10,600
Other, net	4,187	4,651
Increase in assets —
Accounts receivable	(74,970)	(57,583)
Inventories	(22,520)	(4,628)
Prepaid expenses and other current assets	(27,882)	(9,196)
Increase (decrease) in liabilities —
Accounts payable	(12,957)	46,418
Accrued liabilities	21,810	7,109
Federal and state income taxes payable / receivable	30,173	(20,216)
Net cash provided by operating activities	556,720	420,168
Cash Flows from Investing Activities:
Additions to property, plant, and equipment	(254,865)	(130,410)
Acquisition of business, net of cash acquired	(20,290)	0
Additions to other long term assets	(11,617)	(2,459)
Other	3,188	350
Net cash used for investing activities	(283,584)	(132,519)
Cash Flows from Financing Activities:
Repayments of debt and capital lease obligations	(590,641)	(11,967)
Proceeds from issuance of debt	398,864	0
Financing costs paid	3,209	8,220
Common stock dividends paid	(118,004)	(69,883)
Repurchases of common stock	0	(7,799)
Proceeds from exercise of stock options	3,739	2,756
Excess tax benefits from stock-based awards	11,796	7,539
Shares withheld to cover employee restricted stock taxes	(12,051)	(10,873)
Other	(267)	0
Net cash used for financing activities	(309,773)	(98,447)
Net (decrease) increase in cash and cash equivalents	(36,637)	189,202
Cash and cash equivalents, beginning of period	190,960	207,393
Cash and cash equivalents, end of period	$ 154,323	$ 396,595