CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash dividends declared, Common, per share (in dollars per share)	$ 0	$ 0	$ 0
Other Comprehensive Income (Loss), Tax	$ 690	$ (2,427)	$ (1,384)
Vesting of restricted stock units, shares	196,102	384,134	269,924
Treasury shares repurchased, shares	0	0
Vesting of Performance Shares	529,213	0	0
SARS exercised, shares	11,246	28,109	8,965
Treasury Stock
Treasury shares repurchased, shares	1,766,826	1,321,072	0