Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 25,117	[1]	$ 28,924	$ 32,874	$ 30,767
Restricted cash	19,270	[1]	23,761
Trade accounts receivable, less allowance for doubtful accounts of $8,841 and $9,111 at March 31, 2014 and December 31, 2013, respectively	73,447	[1]	70,811
Inventories	70,677	[1]	72,678
Deferred income taxes	40,007	[1]	39,999
Prepaid expenses and other current assets	31,050	[1]	28,933
Total current assets	259,568	[1]	265,106
Property, plant and equipment, net	52,656	[1]	54,372
Patents and other intangible assets, net	8,518	[1]	9,046
Goodwill	53,565	[1]	53,565
Deferred income taxes	22,816	[1]	22,394
Other long-term assets	6,850	[1]	7,492
Total assets	403,973	[1]	411,975
Current liabilities:
Trade accounts payable	14,022	[1]	20,674
Other current liabilities	43,700	[1]	49,676
Total current liabilities	57,722	[1]	70,350
Long-term debt	20,000	[1]	20,000
Deferred income taxes	13,201	[1]	13,026
Other long-term liabilities	12,487	[1]	12,736
Total liabilities	103,410	[1]	116,112
Contingencies (Note 16)		[1]
Shareholders' equity:
Common shares $0.10 par value; 50,000,000 shares authorized; 18,365,910 and 18,102,335 issued and outstanding as of March 31, 2014 and December 31, 2013, respectively	1,836	[1]	1,810
Additional paid-in capital	223,356	[1]	216,653
Retained earnings	71,389	[1]	73,897
Accumulated other comprehensive income	3,982	[1]	3,503
Total shareholders' equity	300,563	[1]	295,863
Total liabilities and shareholders' equity	$ 403,973	[1]	$ 411,975

[1] Unaudited