CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Cash Flows from Operating Activities:
Net Income (Loss)	$ 125,203	$ 328,746	$ 99,992
(Income) loss from discontinued operations	0	209	(831)
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation	301,219	304,557	282,856
Amortization (includes deferred financing costs and bond discount of $7,258, $8,009 and $9,249 in 2013, 2014 and 2015, respectively)	53,494	56,595	46,439
Stock-based compensation expense	27,585	29,624	30,354
(Benefit) provision for deferred income taxes	(7,473)	(270,790)	(99,432)
Loss on early extinguishment of debt, net	27,305	16,495	43,318
(Gain) Loss on disposal/write-down of property, plant and equipment, net (including real estate)	1,941	(9,447)	(1,417)
Foreign currency transactions and other, net	55,891	50,011	63,648
Changes in Assets and Liabilities (exclusive of acquisitions):
Accounts receivable	17,984	113	(33,181)
Prepaid expenses and other	5,171	48,941	48,302
Accounts payable	18,017	16,870	24,168
Accrued expenses and deferred revenue	(77,469)	(101,427)	(5,120)
Other assets and long-term liabilities	(7,108)	2,451	7,497
Cash Flows from Operating Activities-Continuing Operations	541,760	472,948	506,593
Cash Flows from Operating Activities-Discontinued Operations	0	0	953
Cash Flows from Operating Activities	541,760	472,948	507,546
Cash Flows from Investing Activities:
Capital expenditures	(290,249)	(361,924)	(287,295)
Cash paid for acquisitions, net of cash acquired	(113,558)	(128,093)	(317,100)
(Increase) decrease in restricted cash	33,860	0	(248)
Acquisition of customer relationships	(32,611)	(15,074)	(11,043)
Customer inducements	(22,500)	(19,373)	(19,148)
Proceeds from sales of property and equipment and other, net (including real estate)	2,272	44,486	2,084
Cash Flows from Investing Activities-Continuing Operations	(422,786)	(479,978)	(632,750)
Cash Flows from Investing Activities-Discontinued Operations	0	0	(4,937)
Cash Flows from Investing Activities	(422,786)	(479,978)	(637,687)
Cash Flows from Financing Activities:
Repayment of revolving credit and term loan facilities and other debt	(10,796,873)	(8,824,711)	(5,526,672)
Proceeds from revolving credit and term loan facilities and other debt	10,925,709	9,285,187	5,661,750
Early retirement of senior subordinated notes	(814,728)	(566,352)	(685,134)
Net proceeds from sales of senior notes	985,000	642,417	782,307
Debt (repayment to) financing from and equity (distribution to) contribution from noncontrolling interests, net	5,574	(14,770)	(18,236)
Parent cash dividends	(406,508)	(542,298)	(206,798)
Proceeds from exercise of stock options and employee stock purchase plan	7,149	44,290	17,664
Excess tax benefits (deficiency) from stock-based compensation	327	(60)	2,389
Payment of debt financing and stock issuance costs	(14,161)	(3,846)	(8,706)
Cash Flows from Financing Activities-Continuing Operations	(108,511)	19,857	18,564
Cash Flows from Financing Activities-Discontinued Operations	0	0	0
Cash Flows from Financing Activities	(108,511)	19,857	18,564
Effect of Exchange Rates on Cash and Cash Equivalents	(8,015)	(7,420)	(11,312)
Increase (Decrease) in cash and cash equivalents	2,448	5,407	(122,889)
Cash and cash equivalents, beginning of year	125,933	120,526	243,415
Cash and cash equivalents, end of year	128,381	125,933	120,526
Supplemental Information:
Cash Paid for Interest	259,815	257,599	243,380
Cash Paid for Income Taxes	42,440	167,448	125,624
Non-Cash Investing and Financing Activities:
Capital Leases	50,083	24,106	48,488
Accrued Capital Expenditures	51,846	47,529	79,153
Dividends Payable	$ 5,950	$ 6,182	$ 55,142