Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Issuance of common stock excluding excess tax benefits	$ 0	$ 0	$ 0	$ 0
Common Stock [Member]
Issuance of common stock excluding excess tax benefits	0	0	0	0
Additional Paid-in Capital [Member]
Issuance of common stock excluding excess tax benefits	$ 0	$ 0	$ 0	$ 0