Condensed Consolidated Statements of Equity (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Convertible debt extinguishment impact, tax impact				$ 875	$ 2,267	$ 68
Treasury Stock | Restricted stock units
Conversion or settlement to common stock, net of treasury shares purchased (in shares)	1,775	805	138,012	1,805	88,651	51,995
Treasury Stock | Stock appreciation rights
Conversion or settlement to common stock, net of treasury shares purchased (in shares)	1,042	2,274	9,888	577	28,036	14,558