CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Restricted cash	$ 232	$ 392
Accounts receivable, reserves	10,725	11,938
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization on intangible assets	56,078
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
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)	97,115,148	96,688,889
Common stock, shares outstanding (in shares)	97,115,148	96,688,889
Common stock subscribed, shares (in shares)	22,160	26,259
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	19,641	18,591
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization on intangible assets	$ 36,437	$ 34,446