Condensed Consolidation Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 14,083	$ 33,165
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	54,113	51,952
Stock-based compensation	(3,315)	6,250
Interest accretion on notes payable	390	232
Loss on debt extinguishment	(37,109)	(2,377)
Amortization of debt issuance costs	2,141	2,158
Other, including loss on disposal of assets	617	(143)
Increase in accounts receivable	(39,246)	(39,613)
Increase in inventories, prepaid expenses and other current assets	(28,881)	(29,850)
Increase in deposits and other assets	(2,485)	(481)
Increase in accounts payable, deferred revenue, accrued liabilities and other long-term liabilities	105,576	103,365
(Decrease) increase in accrued interest payable	(1,201)	591
Deferred income taxes	(6,035)	8,575
Net cash provided by operating activities	132,866	138,578
Cash flows from investing activities:
Additions to property and equipment	(97,200)	(81,015)
Property insurance recoveries	0	320
Purchase of restricted-use investments, net	1,142	(482)
Proceeds from sale of assets	10	1,552
Net cash used in investing activities	(96,048)	(79,625)
Cash flow from financing activities:
Repayment of borrowings	(920,294)	(333,026)
Proceeds from borrowings	1,313,000	481,000
Payment of debt issuance costs	(37,262)	(5,229)
Payment of cash dividends	(113,284)	(106,937)
Proceeds from issuance of common stock	26,815	15,103
Stock repurchases	(379,386)	(44,091)
Purchase of redeemable noncontrolling interests	128	223
Net cash (used in) provided by financing activities	(110,539)	6,597
Effect of exchange rate on cash	4,615	(1,762)
Net (decrease) increase in cash and cash equivalents	(69,106)	63,788
Cash and cash equivalents at beginning of period	137,385	99,760
Cash and cash equivalents at end of period	68,279	163,548
Supplemental cash flow information
Cash paid for interest	47,099	36,814
Cash paid for income taxes	$ 5,859	$ 10,673