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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts	$ 1,021	$ 805
Property and Equipment, accumulated depreciation	205,209	201,418
Capitalized Software, accumulated amortization	$ 157,933	$ 149,747
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000	750,000
Common stock, shares issued	172,342	172,220
Common stock, shares outstanding	172,342	172,220

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The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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