Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 516,753	$ 502,090
Operating expenses:
Cost of revenues, exclusive of depreciation	281,311	258,493
Business units - Selling, general and administrative expenses, exclusive of depreciation	71,465	73,621
Corporate - General and administrative expenses, exclusive of depreciation	14,735	12,708
Depreciation	14,917	13,471
Amortization of intangible assets	8,689	6,782
Spectrum repacking reimbursements and other	(7,013)	0
Total	384,104	365,075
Operating income	132,649	137,015
Non-operating income (expense):
Equity income (loss) in unconsolidated investments, net	12,028	(1,238)
Interest expense	(46,385)	(47,725)
Other non-operating items, net	(1,539)	(12,480)
Total	(35,896)	(61,443)
Income before income taxes	96,753	75,572
Provision for income taxes	22,774	20,385
Net income	$ 73,979	$ 55,187
Net income per share – basic (In dollars per share)	$ 0.34	$ 0.26
Net income per share – diluted (In dollars per share)	$ 0.34	$ 0.25
Weighted average number of common shares outstanding:
Basic shares (in shares)	216,709	216,276
Diluted shares (in shares)	217,202	216,989