CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (UNAUDITED) (USD $)	Common Stock [Member]	Warrants to acquire Common Stock [Member]	Accumulated Deficit [Member]	Other Comprehensive Loss [Member]	Total
BALANCES at Dec. 31, 2011	$ 212,636,000	$ 17,946,000	$ (72,374,000)	$ 0	$ 158,208,000
BALANCES (in shares) at Dec. 31, 2011	94,936,000				94,936,282
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income	0	0	26,567,000	0	26,567,000
Exercise of stock options	599,000	0	0	0	599,000
Exercise of stock options (in shares)	295,000
Employee stock purchase plan issuances	373,000	0	0	0	373,000
Employee stock purchase plan issuances (in shares)	71,000
Amortization of deferred compensation related to restricted stock awards	287,000	0	0	0	287,000
Amortization of deferred compensation related to restricted stock awards (in shares)	13,000
Stock-based compensation expense	4,762,000	0	0	0	4,762,000
Foreign currency translation adjustment	0	0	0	(3,692,000)	(3,692,000)
Excess tax benefit - stock compensation	2,407,000	0	0	0	2,407,000
BALANCES at Sep. 30, 2012	$ 221,064,000	$ 17,946,000	$ (45,807,000)	$ (3,692,000)	$ 189,511,000
BALANCES (in shares) at Sep. 30, 2012	95,315,000				95,314,602