CONSOLIDATED CONDENSED 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	$ 80,214	$ 54,037
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	42,165	41,766
Stock-based compensation expense	14,376	6,597
Excess income tax benefit from stock-based compensation	(656)	(356)
Deferred income taxes	15,988	(503)
Loss on sale of investments	1,786
(Gain) loss on sale of property and equipment	926	(220)
Other long-term liabilities	1,256	17,877
Other non-cash items	1,324	444
Changes in other components of working capital	(300,804)	(130,700)
NET CASH USED IN OPERATING ACTIVITIES	(143,425)	(11,058)
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases	(37,778)	(39,810)
Proceeds from sale of property and equipment	5,153	2,551
Proceeds from sale of available-for-sale securities	44,497
Change in restricted cash	(4,394)	(8,749)
NET CASH PROVIDED (USED) BY INVESTING ACTIVITIES	7,478	(46,008)
Cash Flows from Financing Activities:
Proceeds from debt	993,010	571,285
Repayment of debt	(808,611)	(536,227)
Business acquisition-related payments	(26,430)	(17,716)
Excess income tax benefit from stock-based compensation	656	356
Issuance of common stock and effect of cashless exercise	(1,692)	(786)
Debt issuance costs	(3,681)
NET CASH PROVIDED BY FINANCING ACTIVITIES	153,252	16,912
Net Increase/(Decrease) in Cash and Cash Equivalents	17,305	(40,154)
Cash and Cash Equivalents at Beginning of Year	119,923	168,056
Cash and Cash Equivalents at End of Period	137,228	127,902
Supplemental Disclosure of Cash Paid For:
Interest	27,447	26,918
Income taxes	47,736	18,449
Supplemental Disclosure of Non-cash Transactions:
Property and equipment acquired through financing arrangements not included above	27,045	458
Grant date fair value of common stock issued for services	$ 5,774	$ 11,393