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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Tax effect on the derecognition of equity component of 5.0% convertible notes |  | $ 662 | $ 627
Tax effect on fair value of interest rate swap agreements | 6,514 | 1,035 | 1,527
Tax benefit associated with change in pension actuarial loss | 460 | 98 | 193
Dividends per share | $ 0.10 | $ 0.10 | $ 0.10
Stated interest rate on debt agreement |  | 5.00% | 5.00%
Convertible senior notes due |  | 2029 | 2029
Paid-In Capital [Member] |  |  |
Tax effect on the derecognition of equity component of 5.0% convertible notes |  | 662 | 627
Stated interest rate on debt agreement |  | 5.00% | 5.00%
Retained Earnings / (Accumulated Deficit) [Member] |  |  |
Dividends per share | $ 0.10 | $ 0.10 | $ 0.10
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Tax effect on fair value of interest rate swap agreements | 6,514 | 1,035 | 1,527
Tax benefit associated with change in pension actuarial loss | $ 460 | $ 98 | $ 193

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