Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other assets noncurrent:
Other intangibles, accumulated amortization	$ 13,460	$ 10,572
Shareholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	39,018,000	38,463,000
Acquired Technology [Member]
Other assets noncurrent:
Other intangibles, accumulated amortization	$ 24,778	$ 16,815