Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 29,784	$ 36,815
Restricted cash	27,253	34,424
Trade accounts receivable, less allowance for doubtful accounts of $6,831 and $7,285 at March 31, 2015 and December 31, 2014, respectively	58,535	61,358
Inventories	56,709	59,846
Deferred income taxes	36,913	37,413
Prepaid expenses and other current assets	25,840	26,552
Total current assets	235,034	256,408
Property, plant and equipment, net	46,737	48,549
Patents and other intangible assets, net	5,888	7,152
Goodwill	53,565	53,565
Deferred income taxes	18,139	18,541
Other long-term assets	27,351	8,970
Total assets	386,714	393,185
Current liabilities:
Trade accounts payable	16,322	13,223
Other current liabilities	53,083	53,220
Total current liabilities	69,405	66,443
Deferred income taxes		229
Other long-term liabilities	26,769	26,886
Total liabilities	96,174	93,558
Contingencies (Note 11)
Shareholders’ equity:
Common shares $0.10 par value; 50,000,000 shares authorized; 18,757,361 and 18,611,495 issued and outstanding as of March 31, 2015 and December 31, 2014, respectively	1,876	1,861
Additional paid-in capital	236,260	232,788
Retained earnings	56,981	65,360
Accumulated other comprehensive loss	(4,577)	(382)
Total shareholders’ equity	290,540	299,627
Total liabilities and shareholders’ equity	$ 386,714	$ 393,185