CONSOLIDATED STATEMENTS OF CASH FLOWS	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Cash flows provided by (used in) operating activities:
Net income (loss)	$ 257,223,000	$ (40,621,000)	$ (26,400,000)
Loss from discontinued operations	0	0	(6,281,000)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	257,223,000	(40,621,000)	(20,119,000)
Share-based Compensation	24,350,000	21,003,000	17,796,000
Adjustments to reconcile income (loss) from continuing operations to cash provided by (used in) operating activities:
Depreciation	23,873,000	22,293,000	18,871,000
Amortization of intangibles	19,601,000	24,153,000	33,352,000
Amortization of deferred finance charges and debt discount	3,022,000	9,135,000	2,270,000
Asset Impairment Charges	4,415,000	48,524,000	0
Loss on redemption of Notes	0	26,873,000	0
Adjustment to deferred acquisition consideration	(4,819,000)	8,227,000	38,887,000
Deferred income taxes	(173,019,000)	(10,038,000)	(79,000)
Earnings (losses) of non-consolidated affiliates	(2,081,000)	309,000	(1,058,000)
Distributions from non-consolidated affiliates	3,672,000	7,402,000	0
Other and non-current assets and liabilities	(4,420,000)	13,527,000	4,680,000
Foreign exchange	(17,637,000)	(8,240,000)	30,185,000
Changes in working capital:
Accounts receivable	(50,030,000)	(16,752,000)	(4,796,000)
Increase (Decrease) in Inventories	(1,892,000)	(13,048,000)	3,879,000
Prepaid expenses and other current assets	6,569,000	(13,608,000)	1,550,000
Accounts payable, accruals and other current liabilities	13,398,000	(110,018,000)	75,111,000
Increase (Decrease) in Deferred Revenue	14,548,000	11,397,000	(23,508,000)
Cash flows provided by (used in) continuing operating activities	115,285,000	(1,212,000)	162,737,000
Discontinued operations	0	0	(1,342,000)
Net cash provided by (used in) operating activities	115,285,000	(1,212,000)	161,395,000
Gain (Loss) on Disposition of Assets	(1,600,000)	(424,000)	(6,526,000)
Cash flows used in investing activities:
Capital expenditures	(32,958,000)	(29,432,000)	(23,575,000)
Increase (Decrease) in Deposit Assets	0	2,528,000	0
Payments for (Proceeds from) Investments	10,631,000	666,000	8,631,000
Acquisitions, net of cash acquired	0	2,531,000	(24,778,000)
Other investments	(2,229,000)	(3,835,000)	(7,272,000)
Cash flows used in continuing investing activities	(20,884,000)	(25,196,000)	(46,994,000)
Discontinued operations	0	0	17,101,000
Net cash used in investing activities	(20,884,000)	(25,196,000)	(29,893,000)
Cash flows used in financing activities:
Acquisition related payments	(99,873,000)	(135,693,000)	(134,056,000)
Distributions to noncontrolling interests	(8,865,000)	(7,772,000)	(9,503,000)
Payment of dividends	(284,000)	(32,918,000)	(42,313,000)
Repayment of long-term debt	(404,000)	(507,000)	(534,000)
Premium paid on redemption of Notes	0	(26,873,000)	0
Deferred financing costs	0	(21,569,000)	0
Purchase of shares	(1,758,000)	(3,350,000)	(2,388,000)
Other	0	0	224,000
Cash flows used in continuing financing activities	(75,389,000)	(9,257,000)	(188,570,000)
Discontinued operations	0	0	(40,000)
Net cash used in financing activities	(75,389,000)	(9,257,000)	(188,610,000)
Effect of exchange rate changes on cash and cash equivalents	(754,000)	2,128,000	5,218,000
(Decrease) increase in cash and cash equivalents	18,258,000	(33,537,000)	(51,890,000)
Cash and cash equivalents at beginning of year	27,921,000	61,458,000	113,348,000
Cash and cash equivalents at end of year	46,179,000	27,921,000	61,458,000
Supplemental disclosures:
Cash income taxes paid	8,099,000	2,895,000	1,887,000
Cash interest paid	62,895,000	64,671,000	52,666,000
Change in cash held in trusts	(709,000)	219,000	(1,297,000)
Non-cash transactions:
Capital leases	670,000	265,000	140,000
Notes Receivable in exchange for shares of subsidiary	6,139,000	0	0
Dividends Payable	453,000	739,000	912,000
Stock Issued During Period, Value, New Issues	27,852,000
Stock Issued During Period, Value, Acquisitions		34,219,000
Leasehold improvements financed by landlord	0	7,250,000	0
Six Point Five Zero Percentage Notes [Domain]
Cash flows used in financing activities:
Proceeds from issuance of notes	0	900,000,000	0
6.75% Notes
Cash flows used in financing activities:
Repayment of 6.75% Notes	0	(735,000,000)	0
Wells Fargo Capital Finance, Llc [Member] | Revolving Credit Facility [Member]
Cash flows used in financing activities:
Repayments of Lines of Credit	(1,479,632,000)	(1,790,108,000)	(703,020,000)
Proceeds from Lines of Credit	1,425,207,000	1,844,533,000	703,020,000
Series 4 Convertible Preferred Stock [Domain]
Cash flows used in financing activities:
Proceeds from Issuance of Convertible Preferred Stock	95,000,000	0	0
Convertible Preferred Stock [Member]
Cash flows used in financing activities:
Payments of Stock Issuance Costs	(4,780,000)	0	0
Common Stock [Member]
Non-cash transactions:
Stock Issued During Period, Value, New Issues	28,727,000
Common Stock [Member] | Common Class A
Non-cash transactions:
Stock Issued During Period, Value, New Issues	28,727	10,458,000	0
Forsman & Bodenfors AB [Domain] | Common Stock [Member] | Common Class A
Non-cash transactions:
Stock Issued During Period, Value, Acquisitions	$ 0	$ 34,219,000	$ 0