CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 43,512	$ 32,336
Trade receivables — net of allowance for uncollectible accounts — 2018 — $1,921 and 2017 — $1,769	131,943	105,536
Other receivables	8,490	9,429
Inventories	169,254	155,288
Prepaid expenses and other assets	12,142	9,096
Prepaid income taxes	3,292	3,225
Income tax refund receivables	2,331	1,211
Total current assets	370,964	316,121
PROPERTY AND EQUIPMENT:
Land and land improvements	26,940	19,877
Buildings	150,726	147,356
Manufacturing equipment	205,911	197,651
Furniture and fixtures	52,649	49,528
Leasehold improvements	33,029	31,161
Construction-in-progress	40,454	32,896
Total property and equipment	509,709	478,469
Less accumulated depreciation	(197,941)	(185,649)
Property and equipment — net	311,768	292,820
OTHER ASSETS:
Goodwill	248,998	238,147
Deferred income tax assets	2,318	2,359
Other assets	58,075	35,040
Total other assets	608,459	502,870
TOTAL	1,291,191	1,111,811
CURRENT LIABILITIES:
Trade payables	50,823	34,931
Accrued expenses	65,838	58,932
Current portion of long-term debt	21,985	19,459
Income taxes payable	948	2,298
Total current liabilities	139,594	115,620
LONG-TERM DEBT	391,582	259,013
DEFERRED INCOME TAX LIABILITIES	23,148	23,289
LONG-TERM INCOME TAXES PAYABLE	4,846	4,846
LIABILITIES RELATED TO UNRECOGNIZED TAX BENEFITS	2,746	2,746
DEFERRED COMPENSATION PAYABLE	11,620	11,181
DEFERRED CREDITS	2,332	2,403
OTHER LONG-TERM OBLIGATIONS	16,069	16,379
Total liabilities	591,937	435,477
COMMITMENTS AND CONTINGENCIES (Notes 5, 10, 11, and 14)
STOCKHOLDERS’ EQUITY:
Preferred stock — 5,000 shares authorized as of June 30, 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 June 30, 2018 - 50,635 and December 31, 2017 - 50,248	359,570	353,392
Retained earnings	337,618	321,408
Accumulated other comprehensive income	2,066	1,534
Total stockholders’ equity	699,254	676,334
TOTAL	1,291,191	1,111,811
Developed technology — net of accumulated amortization — 2018 — $86,023 and 2017 — $72,420
OTHER ASSETS:
Intangible assets	232,880	167,771
Other — net of accumulated amortization — 2018 — $43,246 and 2017 — $38,127
OTHER ASSETS:
Intangible assets	$ 66,188	$ 59,553