Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (7,395)	$ (14,429)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,282	23,097
Amortization of debt issuance costs/discounts	2,510	2,427
Provision for doubtful accounts	709	150
(Gain) loss on sale of assets or stations	(2,606)	5
Deferred income taxes	(6,030)	(9,136)
Stock-based compensation expense	538	878
Changes in assets and liabilities:
Accounts receivable	17,234	37,090
Trade receivable	(767)	235
Prepaid expenses and other current assets	(12,429)	(5,971)
Other assets	309	(5,751)
Accounts payable and accrued expenses	12,852	7,154
Trade payable	(820)	(28)
Other liabilities	(962)	(2,536)
Net cash provided by operating activities	19,425	33,185
Cash flows from investing activities:
Restricted cash	209	(1,810)
Proceeds from sale of assets or stations	6,090	0
Capital expenditures	(5,736)	(4,161)
Net cash provided by (used in) investing activities	563	(5,971)
Cash flows from financing activities:
Deferred financing costs	(94)	0
Proceeds from exercise of warrants	0	3
Net cash (used in) provided by financing activities	(94)	3
Increase in cash and cash equivalents	19,894	27,217
Cash and cash equivalents at beginning of period	131,259	31,657
Cash and cash equivalents at end of period	151,153	58,874
Supplemental disclosures of cash flow information:
Interest paid	19,448	19,539
Income taxes paid	463	983
Supplemental disclosures of non-cash flow information:
Trade revenue	11,309	9,961
Trade expense	$ 9,567	$ 10,027