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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current Assets:    
Cash and cash equivalents $ 55,730 $ 69,354
Accounts receivable, net of allowance for doubtful accounts of $2,388 in 2018 and $1,745 in 2017 88,972 78,808
Unbilled receivables 15,587 0
Inventories 106,448 107,719
Other current assets 12,383 10,218
Total current assets 279,120 266,099
Property, plant and equipment, net 42,944 43,495
Intangible assets, net 65,784 69,366
Goodwill 18,972 20,177
Deferred income taxes 2,380 4,155
Other assets 27,548 27,973
Total assets 436,748 431,265
Current Liabilities:    
Accounts payable 59,370 47,947
Accrued expenses 29,252 30,508
Current portion of long-term debt 2,506 2,641
Other current liabilities 5,077 6,204
Total current liabilities 96,205 87,300
Long-term Liabilities:    
Long-term debt 112,958 120,053
Liability for uncertain tax positions 28,409 27,948
Minimum pension obligation and unfunded pension liability 19,673 19,134
Deferred income taxes 1,614 1,567
Other liabilities 14,592 17,303
Total liabilities 273,451 273,305
Commitments and contingencies
Stockholders' Equity:    
Preferred stock, no par value, 1,000,000 shares authorized; none issued 0 0
Additional paid-in capital 30,027 28,575
Retained earnings 154,985 147,807
Accumulated other comprehensive loss (22,916) (19,625)
Total stockholders' equity 163,297 157,960
Total liabilities and stockholders' equity 436,748 431,265
Class A Common Stock [Member]    
Stockholders' Equity:    
Common Stock 217 217
Class B Common Stock [Member]    
Stockholders' Equity:    
Common Stock $ 984 $ 986