CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests	ASU 2016-02	ASU 2016-02 Retained Earnings	ASU 2016-02 Total Shareholders' Equity	ASU 2016-02 Noncontrolling Interests
BALANCE, beginning of year (in shares) at Dec. 31, 2017		139,918,000
BALANCE, beginning of year at Dec. 31, 2017	$ 3,492,399	$ 1,399	$ 88,222	$ (402,242)	$ 3,654,931	$ 3,342,310	$ 150,089
Increase (Decrease) in Shareholders' Equity
Net earnings (loss)	(12,061)				(17,590)	(17,590)	5,529
Other comprehensive income	29,622			29,282		29,282	340
Dividends ($0.21 per share)	(29,854)		(88)		(29,766)	(29,854)
Distributions to noncontrolling interests	(23,226)						(23,226)
Capital contributions by noncontrolling interests	365						365
Other noncontrolling interest transactions	1,742		880			880	862
Stock-based plan activity (in shares)		680,000
Stock-based plan activity	10,021	$ 7	10,014			10,021
BALANCE, end of year (in shares) at Mar. 31, 2018		140,598,000
BALANCE, end of year at Mar. 31, 2018	3,129,307	$ 1,406	99,028	(372,960)	3,268,837	2,996,311	132,996
BALANCE, beginning of year (in shares) at Dec. 31, 2018		139,654,000
BALANCE, beginning of year at Dec. 31, 2018	3,118,050	$ 1,396	82,106	(542,478)	3,422,157	2,963,181	154,869
Increase (Decrease) in Shareholders' Equity
Net earnings (loss)	(43,308)				(58,426)	(58,426)	15,118
Other comprehensive income	45,069			44,584		44,584	485
Dividends ($0.21 per share)	(29,705)		218		(29,923)	(29,705)
Distributions to noncontrolling interests	(10,152)						(10,152)
Capital contributions by noncontrolling interests	4,767						4,767
Other noncontrolling interest transactions	(440)		1,035			1,035	(1,475)
Stock-based plan activity (in shares)		455,000
Stock-based plan activity	11,100	$ 3	11,097			11,100
BALANCE, end of year (in shares) at Mar. 31, 2019		140,109,000
BALANCE, end of year at Mar. 31, 2019	$ 3,115,925	$ 1,399	$ 94,456	$ (497,894)	$ 3,354,352	$ 2,952,313	$ 163,612
Increase (Decrease) in Shareholders' Equity
Cumulative adjustment for the adoption of ASC 606								$ 20,544	$ 20,544	$ 20,544	$ 0