CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities:
Net income	$ 16,903	$ 44,484
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	21,434	30,078
Stock-based compensation expense	13,324	9,920
Excess income tax benefit from stock-based compensation	(162)
Deferred income taxes	(177)	(64)
Loss on sale of investments		1,786
(Gain) loss on sale of property and equipment	(313)	427
Other long-term liabilities	42	5,559
Other non-cash items	(3,259)	1,562
Changes in other components of working capital	(79,550)	(155,187)
NET CASH USED IN OPERATING ACTIVITIES	(31,758)	(61,435)
Cash Flows from Investing Activities:
Acquisition of property and equipment excluding financed purchases	(29,544)	(26,730)
Proceeds from sale of property and equipment	1,122	1,906
Proceeds from sale of available-for-sale securities		44,497
Change in restricted cash	4,877	(33)
NET CASH (USED BY) PROVIDED BY INVESTING ACTIVITIES	(23,545)	19,640
Cash Flows from Financing Activities:
Proceeds from debt	473,490	717,484
Repayment of debt	(446,239)	(649,282)
Business acquisition-related payments		(1,260)
Excess income tax benefit from stock-based compensation	162
Issuance of common stock and effect of cashless exercise	(776)	(1,531)
Debt issuance costs		(3,681)
NET CASH PROVIDED BY FINANCING ACTIVITIES	26,637	61,730
Net (Decrease) Increase in Cash and Cash Equivalents	(28,666)	19,935
Cash and Cash Equivalents at Beginning of Year	135,583	119,923
Cash and Cash Equivalents at End of Period	106,917	139,858
Supplemental Disclosure of Cash Paid For:
Interest	26,148	21,830
Income taxes	$ 19,717	33,668
Supplemental Disclosure of Non-cash Transactions:
Property and equipment acquired through financing arrangements not included above		$ 27,045