CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 35,182	$ 67,359
Trade receivables — net of allowance for uncollectible accounts — 2019 — $2,656 and 2018 — $2,355	156,444	137,174
Other receivables	11,520	11,879
Inventories	202,994	197,536
Prepaid expenses and current other assets	12,305	11,326
Prepaid income taxes	3,625	3,627
Income tax refund receivables	4,876	933
Total current assets	426,946	429,834
PROPERTY AND EQUIPMENT:
Land and land improvements	27,651	26,801
Buildings	153,502	151,251
Manufacturing equipment	230,315	221,029
Furniture and fixtures	57,565	54,765
Leasehold improvements	34,518	33,678
Construction-in-progress	69,370	53,491
Total property and equipment	572,921	541,015
Less accumulated depreciation	(222,402)	(209,563)
Property and equipment — net	350,519	331,452
OTHER ASSETS:
Intangible assets	74,419	79,566
Goodwill	352,133	335,433
Deferred income tax assets	3,038	3,001
Right-of-use operating lease assets	79,309
Other assets	58,255	57,579
Total other assets	958,805	858,726
TOTAL	1,736,270	1,620,012
CURRENT LIABILITIES:
Trade payables	52,601	54,024
Accrued expenses	97,176	96,173
Current portion of long-term debt	15,000	22,000
Short-term operating lease liabilities	11,732
Income taxes payable	42	3,146
Total current liabilities	176,551	175,343
LONG-TERM DEBT	385,221	373,152
DEFERRED INCOME TAX LIABILITIES	60,932	56,363
LONG-TERM INCOME TAXES PAYABLE	392	392
LIABILITIES RELATED TO UNRECOGNIZED TAX BENEFITS	3,013	3,013
DEFERRED COMPENSATION PAYABLE	12,739	11,219
DEFERRED CREDITS	2,192	2,261
LONG-TERM OPERATING LEASE LIABILITIES	71,272
OTHER LONG-TERM OBLIGATIONS	73,283	65,494
Total liabilities	785,595	687,237
COMMITMENTS AND CONTINGENCIES (Notes 5, 10, 11, 14 and 15)
STOCKHOLDERS’ EQUITY:
Preferred stock — 5,000 shares authorized as of June 30, 2019 and December 31, 2018; no shares issued	0	0
Common stock, no par value; shares authorized — 2019 and 2018 - 100,000; issued and outstanding as of June 30, 2019 - 55,079 and December 31, 2018 - 54,893	579,250	571,383
Retained earnings	376,572	363,425
Accumulated other comprehensive loss	(5,147)	(2,033)
Total stockholders’ equity	950,675	932,775
TOTAL	1,736,270	1,620,012
Developed technology — net of accumulated amortization — 2019 — $125,447 and 2018 — $102,357
OTHER ASSETS:
Intangible assets	391,651	383,147
Other — net of accumulated amortization — 2019 — $56,289 and 2018 — $49,136
OTHER ASSETS:
Intangible assets	$ 74,419	$ 79,566