CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Restricted cash	$ 392	$ 813
Accounts receivable, allowance for doubtful accounts and sales returns	11,938	14,074
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization on intangible assets	53,036	38,891
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
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)	96,688,889	93,137,737
Common stock, shares outstanding (in shares)	96,688,889	93,137,737
Common stock subscribed, shares (in shares)	26,259	158,395
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
Purchased and Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization on intangible assets	18,570	13,884
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization on intangible assets	$ 34,466	$ 25,007