Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	May 31, 2013	May 31, 2012
OPERATING ACTIVITIES
Net income	$ 35,953	$ 30,879
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	39,500	38,626
Stock-based compensation	1,088	809
Amortization of financing costs	718	889
Deferred income taxes	1,876	6,711
Income from equity investments	(4,251)	(1,094)
Distribution from equity investee	5,000	0
Loss on asset retirements, non-cash	1,184	5,703
Other, net	(33)	(898)
Changes in operating assets and liabilities:
Receivables, net	(17,944)	(12,090)
Inventories, prepaid expenses and other assets	(8,530)	(7,447)
Accounts payable and other liabilities	296	(7,098)
Deferred income	41,085	41,374
Income taxes	5,819	1,778
Net cash provided by operating activities	101,761	98,142
INVESTING ACTIVITIES
Capital expenditures	(21,632)	(26,092)
Distribution from equity investee and affiliate	4,500	0
Equity investments and advances to affiliate	0	(51,556)
Other, net	111	1,408
Net cash used in investing activities	(17,021)	(76,240)
FINANCING ACTIVITIES
Payment under credit facility	0	(60,000)
Proceeds from credit facility	0	130,000
Payment of long-term debt	(334)	(87,356)
Exercise of Class A common stock options	51	0
Reacquisition of previously issued common stock	(259)	(10,556)
Net cash used in financing activities	(542)	(27,912)
Net increase (decrease) in cash and cash equivalents	84,198	(6,010)
Cash and cash equivalents at beginning of period	78,379	110,078
Cash and cash equivalents at end of period	$ 162,577	$ 104,068