CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities:
Net income	$ 36,580	$ 80,214
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	32,528	42,165
Stock-based compensation expense	17,064	14,376
Excess income tax benefit from stock-based compensation	(186)	(656)
Deferred income taxes	6,366	15,988
Loss on sale of investments		1,786
(Gain) loss on sale of property and equipment	(821)	926
Other long-term liabilities	(1,379)	1,256
Other non-cash items	(5,692)	1,324
Changes in other components of working capital	(63,786)	(300,804)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	20,674	(143,425)
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases	(33,365)	(37,778)
Proceeds from sale of property and equipment	2,220	5,153
Proceeds from sale of available-for-sale securities		44,497
Change in restricted cash	5,798	(4,394)
NET CASH (USED BY) PROVIDED BY INVESTING ACTIVITIES	(25,347)	7,478
Cash Flows from Financing Activities:
Proceeds from debt	672,719	993,010
Repayment of debt	(706,113)	(808,611)
Business acquisition-related payments		(26,430)
Excess income tax benefit from stock-based compensation	186	656
Issuance of common stock and effect of cashless exercise	(808)	(1,692)
Debt issuance costs		(3,681)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(34,016)	153,252
Net (Decrease) Increase in Cash and Cash Equivalents	(38,689)	17,305
Cash and Cash Equivalents at Beginning of Year	135,583	119,923
Cash and Cash Equivalents at End of Period	96,894	137,228
Supplemental Disclosure of Cash Paid For:
Interest	28,706	27,447
Income taxes	$ 21,565	47,736
Supplemental Disclosure of Non-cash Transactions:
Property and equipment acquired through financing arrangements not included above		$ 27,045