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CONDENSED CONSOLIDATED BALANCE SHEETS - UNAUDITED (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Trade accounts receivable-billed, allowance | $ 2,906 | $ 3,600
Property and equipment, accumulated depreciation | 120,813 | 112,282
Accumulated amortization | 195,473 | 182,984
Current portion of long-term debt, unamortized discounts | 734 | 8,632
Long-term debt, unamortized discounts | $ 24,169 | $ 4,738
Preferred stock, par value | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 10,000,000 | 10,000,000
Preferred stock, shares issued | 0 | 0
Preferred stock, shares outstanding | 0 | 0
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 100,000,000 | 100,000,000
Common stock, shares outstanding | 32,317,000 | 32,555,000
Common stock warrants, issued | 2,851,000 | 2,851,000
Common stock warrants, outstanding | 2,851,000 | 2,851,000
Treasury stock, shares | 34,865,000 | 34,601,000
Software |  |
Accumulated amortization | $ 101,176 | $ 95,094
Client contracts |  |
Accumulated amortization | $ 94,297 | $ 87,890

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