CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 34,171	$ 32,336
Trade receivables — net of allowance for uncollectible accounts — 2018 — $1,905 and 2017 — $1,769	119,146	105,536
Other receivables	8,727	9,429
Inventories	166,716	155,288
Prepaid expenses and other assets	10,360	9,096
Prepaid income taxes	3,323	3,225
Income tax refund receivables	1,327	1,211
Total current assets	343,770	316,121
PROPERTY AND EQUIPMENT:
Land and land improvements	27,285	19,877
Buildings	148,278	147,356
Manufacturing equipment	204,053	197,651
Furniture and fixtures	50,840	49,528
Leasehold improvements	32,109	31,161
Construction-in-progress	32,986	32,896
Total property and equipment	495,551	478,469
Less accumulated depreciation	(191,826)	(185,649)
Property and equipment — net	303,725	292,820
OTHER ASSETS:
Goodwill	244,125	238,147
Deferred income tax assets	2,441	2,359
Other assets	37,271	35,040
Total other assets	591,714	502,870
TOTAL	1,239,209	1,111,811
CURRENT LIABILITIES:
Trade payables	43,739	34,931
Accrued expenses	57,531	58,932
Current portion of long-term debt	20,733	19,459
Income taxes payable	2,397	2,298
Total current liabilities	124,400	115,620
LONG-TERM DEBT	365,797	259,013
DEFERRED INCOME TAX LIABILITIES	23,330	23,289
LONG-TERM INCOME TAXES PAYABLE	4,846	4,846
LIABILITIES RELATED TO UNRECOGNIZED TAX BENEFITS	2,746	2,746
DEFERRED COMPENSATION PAYABLE	11,185	11,181
DEFERRED CREDITS	2,367	2,403
OTHER LONG-TERM OBLIGATIONS	16,027	16,379
Total liabilities	550,698	435,477
COMMITMENTS AND CONTINGENCIES (Notes 5, 10, 11, and 14)
STOCKHOLDERS’ EQUITY:
Preferred stock — 5,000 shares authorized as of March 31, 2018 and December 31, 2017; no shares issued	0	0
Common stock, no par value; shares authorized — 2018 and 2017 - 100,000; issued and outstanding as of March 31, 2018 - 50,346 and December 31, 2017 - 50,248	356,228	353,392
Retained earnings	326,677	321,408
Accumulated other comprehensive income	5,606	1,534
Total stockholders’ equity	688,511	676,334
TOTAL	1,239,209	1,111,811
Developed technology — net of accumulated amortization — 2018 — $78,573 and 2017 — $72,420
OTHER ASSETS:
Intangible assets	241,677	167,771
Other — net of accumulated amortization — 2018 — $40,518 and 2017 — $38,127
OTHER ASSETS:
Intangible assets	$ 66,200	$ 59,553