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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Accounts receivable, allowance for doubtful accounts | $ 2,335 | $ 2,507
LIABILITIES AND STOCKHOLDERS' EQUITY |  |
Preferred Stock of subsidiary, par value (in dollars per share) | $ 1.00 | $ 1.00
Preferred Stock of subsidiary, authorized (in shares) | 1,467,396 | 1,467,396
Preferred Stock of subsidiary, issued plus accrued and unpaid dividends (in shares) | 1,284,730 | 1,284,730
Preferred Stock of subsidiary, outstanding plus accrued and unpaid dividends (in shares) | 1,284,730 | 1,284,730
Preferred Stock of subsidiary, Liquidation value per share (in dollars per share) | $ 1.00 | $ 1.00
Preferred Stock of subsidiary, unpaid dividends | $ 707 | $ 674
Stockholders' Equity: |  |
Preferred Stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Preferred Stock, authorized (in shares) | 2,000,000 | 2,000,000
Preferred Stock, issued (in shares) | 0 | 0
Preferred Stock, outstanding (in shares) | 0 | 0
Common Stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common Stock, authorized (in shares) | 75,000,000 | 75,000,000
Common Stock, issued (in shares) | 56,372,273 | 56,238,525
Common Stock, outstanding (in shares) | 56,334,063 | 56,200,315
Common Stock, in treasury (in shares) | 38,210 | 38,210

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