Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 85,966	$ 191,363
Accounts receivable, net of allowance of $5,781 and $6,330	172,452	147,515
Inventories	88,585	78,476
Prepaid expenses and other current assets	16,149	19,748
Total current assets	363,152	437,102
Property, plant, and equipment, net	95,882	95,409
Operating lease assets	33,991	27,662
Goodwill	382,045	329,705
Acquired intangibles	107,528	92,592
Other assets	1,924	1,980
Total assets	984,522	984,450
Current liabilities:
Accounts payable	102,816	83,136
Accrued expenses	84,140	98,463
Billings in excess of cost	34,567	47,598
Total current liabilities	221,523	229,197
Deferred income taxes	39,999	40,334
Non-current operating lease liabilities	24,968	19,669
Other non-current liabilities	20,675	21,286
Shareholders’ equity:
Preferred stock, $0.01 par value; authorized 10,000 shares; none outstanding	0	0
Common stock, $0.01 par value; authorized 50,000 shares; 33,388 shares and 33,192 shares issued and outstanding in 2020 and 2019	334	332
Additional paid-in capital	297,269	295,582
Retained earnings	417,436	405,668
Accumulated other comprehensive loss	(11,271)	(5,391)
Cost of 986 and 906 common shares held in treasury in 2020 and 2019	(26,411)	(22,227)
Total shareholders’ equity	677,357	673,964
Total liabilities and shareholders' equity	$ 984,522	$ 984,450