CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Restricted cash	$ 813	$ 707
Accounts receivable, allowance for doubtful accounts and sales returns	14,074	4,080
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization on intangible assets	38,891	24,190
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	93,137,737	90,939,053
Common stock, shares outstanding (in shares)	93,137,737	90,939,053
Common stock subscribed, shares (in shares)	158,395	195,116
Series A Non-voting Preferred Stock [Member]
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000	50,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, aggregate liquidation preference	0	0
Series B Preferred Stock [Member]
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 1.01	$ 1.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Purchased and Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization on intangible assets	13,884	9,283
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization on intangible assets	$ 25,007	$ 14,907