Note 20 - Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

	Shares			Weighted-Average Exercise Price Per Share		Aggregate Intrinsic Value (in millions)
Options outstanding, January 1, 2017		6,013,729		$	32.09	$	12.1
Exercised		(83,863	)	$	18.20	$	3.4
Forfeited		(2,464,920	)	$	35.91
Options outstanding, December 31, 2017		3,464,946		$	27.81	$	-
Exercised		(42,259	)	$	14.00	$	0.1
Forfeited		(1,781,321	)	$	36.53
Options outstanding, December 31, 2018		1,641,366		$	18.78	$	0.4
Exercised		(268,856	)	$	14.43	$	1.1
Forfeited		(74,574	)	$	20.24
Options outstanding, December 31, 2019		1,297,936		$	19.60	$	2.0
Options exercisable (fully vested) -
December 31, 2017		3,464,946		$	27.81	$	4.0
December 31, 2018		1,641,366		$	18.78	$	0.4
December 31, 2019		1,297,936		$	19.60	$	2.0

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

	2019			2018			2017
Restricted stock outstanding as of January 1,		2,104,914			1,777,429			1,930,732
Granted (1)		884,170			1,100,590			646,142
Vested		(603,148	)		(751,201	)		(783,872	)
Forfeited		(18,093	)		(21,904	)		(15,573	)
Restricted stock outstanding as of December 31,		2,367,843			2,104,914			1,777,429

Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block]

	2019			2018			2017
Performance share awards outstanding as of January 1,		433,230			235,950			197,249
Granted (1)		407,080			297,450			135,780
Vested (2)		(135,780	)		(100,170	)		(97,079	)
Performance share awards outstanding as of December 31,		704,530			433,230			235,950

Performance Shares [Member]

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2019			2018			2017
Stock price	$	17.81		$	14.99		$	24.91
Dividend yield (1)		0	%		0	%		0	%
Risk-free rate		2.52	%		2.39	%		1.45	%
Volatility (2)		24.55	%		22.90	%		18.93	%
Term of the award (years)		2.88			2.85			2.88