CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Beginning Balance (in shares) at Dec. 31, 2017		132,349,534		(36,315,182)
Beginning Balance at Dec. 31, 2017	$ 2,828,532,000	$ 1,323,000	$ 906,616,000	$ (827,379,000)	$ 2,773,300,000	$ (44,992,000)	$ 19,664,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(11,531,000)				(11,531,000)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax (in shares)				193,013
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(1,289,000)		(4,511,000)	$ 3,222,000
Stock based compensation	5,696,000		5,696,000
Net income (loss)	87,457,000				88,366,000		(909,000)
Other comprehensive loss, net of tax	79,008,000					79,008,000
Other owner changes	356,000						356,000
Ending Balance (in shares) at Mar. 31, 2018		132,349,534		(36,122,169)
Ending Balance at Mar. 31, 2018	2,988,229,000	$ 1,323,000	907,801,000	$ (824,157,000)	2,850,135,000	34,016,000	19,111,000
Beginning Balance (in shares) at Dec. 31, 2017		132,349,534		(36,315,182)
Beginning Balance at Dec. 31, 2017	2,828,532,000	$ 1,323,000	906,616,000	$ (827,379,000)	2,773,300,000	(44,992,000)	19,664,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(23,096,000)
Net income (loss)	170,728,000
Other comprehensive loss, net of tax	(111,209,000)
Ending Balance (in shares) at Jun. 30, 2018		132,349,534		(35,963,155)
Ending Balance at Jun. 30, 2018	2,874,628,000	$ 1,323,000	910,350,000	$ (821,178,000)	2,922,986,000	(156,201,000)	17,348,000
Beginning Balance (in shares) at Mar. 31, 2018		132,349,534		(36,122,169)
Beginning Balance at Mar. 31, 2018	2,988,229,000	$ 1,323,000	907,801,000	$ (824,157,000)	2,850,135,000	34,016,000	19,111,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(11,565,000)				(11,565,000)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax (in shares)				159,014
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(2,759,000)		(5,738,000)	$ 2,979,000
Stock based compensation	8,287,000		8,287,000
Net income (loss)	83,271,000				84,416,000		(1,145,000)
Other comprehensive loss, net of tax	(190,217,000)					(190,217,000)
Other owner changes	(618,000)						(618,000)
Ending Balance (in shares) at Jun. 30, 2018		132,349,534		(35,963,155)
Ending Balance at Jun. 30, 2018	$ 2,874,628,000	$ 1,323,000	910,350,000	$ (821,178,000)	2,922,986,000	(156,201,000)	17,348,000
Beginning Balance (in shares) at Dec. 31, 2018	132,349,534	132,349,534		(35,734,588)
Beginning Balance at Dec. 31, 2018	$ 2,869,075,000	$ 1,323,000	914,568,000	$ (816,145,000)	3,021,968,000	(256,583,000)	3,944,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(11,687,000)				(11,687,000)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax (in shares)				420,472
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(5,515,000)		(14,446,000)	$ 8,931,000
Stock based compensation	8,526,000		8,526,000
Net income (loss)	(4,013,000)				(4,472,000)		459,000
Other comprehensive loss, net of tax	(52,417,000)					(52,417,000)
Acquisitions (in shares)		65,782,182
Acquisitions	6,975,045,000	$ 658,000	6,887,622,000				86,765,000
Other owner changes	1,432,000						1,432,000
Ending Balance (in shares) at Mar. 31, 2019		198,131,716		(35,314,116)
Ending Balance at Mar. 31, 2019	$ 9,780,446,000	$ 1,981,000	7,796,270,000	$ (807,214,000)	3,005,809,000	(309,000,000)	92,600,000
Beginning Balance (in shares) at Dec. 31, 2018	132,349,534	132,349,534		(35,734,588)
Beginning Balance at Dec. 31, 2018	$ 2,869,075,000	$ 1,323,000	914,568,000	$ (816,145,000)	3,021,968,000	(256,583,000)	3,944,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(34,264,000)
Net income (loss)	98,841,000
Other comprehensive loss, net of tax	(32,597,000)
Ending Balance (in shares) at Jun. 30, 2019		223,431,716		(35,248,610)
Ending Balance at Jun. 30, 2019	9,835,157,000	$ 1,981,000	7,807,109,000	$ (805,618,000)	3,087,468,000	(289,180,000)	33,397,000
Beginning Balance (in shares) at Mar. 31, 2019		198,131,716		(35,314,116)
Beginning Balance at Mar. 31, 2019	9,780,446,000	$ 1,981,000	7,796,270,000	$ (807,214,000)	3,005,809,000	(309,000,000)	92,600,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends	(22,576,000)				(22,576,000)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax (in shares)				65,506
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(2,971,000)		(4,567,000)	$ 1,596,000
Stock based compensation	15,406,000		15,406,000
Net income (loss)	102,854,000				104,235,000		(1,381,000)
Other comprehensive loss, net of tax	19,820,000					19,820,000
Acquisitions	(56,179,000)						(56,179,000)
Other owner changes	(1,643,000)	$ 25,300,000					(1,643,000)
Ending Balance (in shares) at Jun. 30, 2019		223,431,716		(35,248,610)
Ending Balance at Jun. 30, 2019	$ 9,835,157,000	$ 1,981,000	$ 7,807,109,000	$ (805,618,000)	$ 3,087,468,000	$ (289,180,000)	$ 33,397,000