CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities:
Net income	$ 20,653	$ 53,780
Amounts to reconcile net income to net cash flows provided by operating activities:
Income from discontinued operations, net of taxes	(11)	(10)
Impairment and other charges		132
Benefit for deferred income taxes	(1,070)	(67,107)
Depreciation and amortization	28,003	32,009
Amortization of deferred financing costs	1,421	1,165
Amortization of discount on convertible notes	3,274	3,593
Write-off of deferred financing costs		544
Stock-based compensation expense	1,281	2,680
Excess tax benefit from stock-based compensation	(10)	(212)
Changes in:
Trade receivables	(15,373)	(5,402)
Interest receivable	422	475
Accounts payable and accrued liabilities	(13,299)	(74,405)
Other assets and liabilities	4,770	5,847
Net cash flows provided by (used in) operating activities - continuing operations	30,061	(46,911)
Net cash flows provided by (used in) operating activities - discontinued operations	(230)	49
Net cash flows provided by (used in) operating activities	29,831	(46,862)
Cash Flows from Investing Activities:
Purchases of property and equipment	(17,484)	(10,139)
(Increase) decrease in restricted cash and cash equivalents	9,509	(724)
Other investing activities		9
Net cash flows used in investing activities - continuing operations	(7,975)	(10,854)
Net cash flows used in investing activities - discontinued operations
Net cash flows used in investing activities	(7,975)	(10,854)
Cash Flows from Financing Activities:
Net borrowings (repayments) under credit facility	(3,500)	209,000
Early redemption of senior notes		(152,180)
Deferred financing costs paid		(22)
Repurchase of Company stock for retirement		(55,676)
Payment of dividend	(25,459)
Proceeds from exercise of stock option and purchase plans	1,078	4,255
Excess tax benefit from stock-based compensation	10	212
Other financing activities, net	(147)	(195)
Net cash flows provided by (used in) financing activities - continuing operations	(28,018)	5,394
Net cash flows provided by financing activities - discontinued operations
Net cash flows provided by (used in) financing activities	(28,018)	5,394
Net change in cash and cash equivalents	(6,162)	(52,322)
Cash and cash equivalents - unrestricted, beginning of period	61,579	97,170
Cash and cash equivalents - unrestricted, end of period	$ 55,417	$ 44,848