Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 29,825	$ 28,924	$ 20,729	$ 30,767
Restricted cash	34,630	23,761
Trade accounts receivable, less allowance for doubtful accounts of $8,118 and $9,111 at September 30, 2014 and December 31, 2013, respectively	62,505	70,811
Inventories	64,266	72,678
Deferred income taxes	39,847	39,999
Prepaid expenses and other current assets	39,272	28,933
Total current assets	270,345	265,106
Property, plant and equipment, net	49,616	54,372
Patents and other intangible assets, net	7,455	9,046
Goodwill	53,565	53,565
Deferred income taxes	21,226	22,394
Other long-term assets	8,838	7,492
Total assets	411,045	411,975
Current liabilities:
Trade accounts payable	13,233	20,674
Other current liabilities	68,148	49,676
Total current liabilities	81,381	70,350
Long-term debt		20,000
Deferred income taxes	12,886	13,026
Other long-term liabilities	11,762	12,736
Total liabilities	106,029	116,112
Contingencies (Note 16)
Shareholders' equity:
Common shares $0.10 par value; 50,000,000 shares authorized; 18,604,197 and 18,102,335 issued and outstanding as of September 30, 2014 and December 31, 2013, respectively	1,861	1,810
Additional paid-in capital	231,038	216,653
Retained earnings	71,158	73,897
Accumulated other comprehensive income	959	3,503
Total shareholders' equity	305,016	295,863
Total liabilities and shareholders' equity	$ 411,045	$ 411,975