Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 73,979	$ 55,187
Adjustments to reconcile net income to net cash flow from operating activities:
Depreciation and amortization	23,606	20,253
Stock-based compensation	4,433	3,599
Other gains on sales of assets	(2,880)	(1,010)
Equity income (loss) in unconsolidated investments, net	12,028	(1,238)
Pension contributions, net of expense	(242)	(23,072)
Change in other assets and liabilities, net	(38,459)	(5,009)
Net cash flow from operating activities	48,409	51,186
Cash flows from investing activities:
Purchase of property and equipment	(24,810)	(10,643)
Reimbursements from spectrum repacking	4,134	0
Payments for acquisitions of businesses, net of cash acquired	(108,872)	(325,903)
Payments for investments	(1,171)	(3,991)
Proceeds from investments	618	1,010
Proceeds from sale of assets and businesses	20,064	1,373
Net cash flow used for investing activities	(110,037)	(338,154)
Cash flows from financing activities:
(Payments) proceeds of borrowings under revolving credit facilities, net	(30,000)	220,000
Debt repayments	(25,000)	(33,062)
Dividends paid	(15,078)	(15,043)
Other, net	(338)	(4,630)
Net cash flow (used for) provided by financing activities	(70,416)	167,265
(Decrease) in cash, cash equivalents and restricted cash	(132,044)	(119,703)
Balance of cash, cash equivalents and restricted cash, beginning of period	135,862	128,041
Balance of cash, cash equivalents and restricted cash, end of period	$ 3,818	$ 8,338