Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 32,054	$ 191,363
Accounts receivable, net of allowance of $3,529 and $5,951	197,990	133,895
Inventories, net	98,307	61,957
Prepaid expenses and other current assets	19,671	18,959
Assets of discontinued operations	77,438	30,928
Total current assets	425,460	437,102
Property, plant, and equipment, net	89,562	78,152
Operating lease assets	25,229	21,201
Goodwill	514,279	307,355
Acquired intangibles	156,365	76,734
Other assets	1,599	1,980
Assets of discontinued operations	0	61,926
Total assets	1,212,494	984,450
Current liabilities:
Accounts payable	134,738	72,628
Accrued expenses	83,505	86,597
Billings in excess of cost	34,702	47,598
Liabilities of discontinued operations	49,295	22,374
Total current liabilities	302,240	229,197
Long-term debt	85,636	0
Deferred income taxes	39,057	35,404
Non-current operating lease liabilities	17,730	14,943
Other non-current liabilities	24,026	21,272
Liabilities of discontinued operations	0	9,670
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; 33,568 and 33,192 shares issued in 2020 and 2019	336	332
Additional paid-in capital	304,870	295,582
Retained earnings	469,943	405,668
Accumulated other comprehensive loss	(2,461)	(5,391)
Cost of 1,028 and 906 common shares held in treasury in 2020 and 2019	(28,883)	(22,227)
Total shareholders’ equity	743,805	673,964
Total liabilities and shareholders' equity	$ 1,212,494	$ 984,450
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01