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Condensed Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Tax effect on fair value of interest rate swap agreements | $ (72) | $ 5,083 | $ (50)
Dividends per share | $ 0.025 | $ 0.075 | $ 0.075
Paid-In Capital [Member] |  |  |
Stated Interest rate on debt agreement | 5.00% |  | 5.00%
Convertible senior notes due | 2029 |  | 2029
Retained Earnings / (Accumulated Deficit) [Member] |  |  |
Dividends per share |  | $ 0.075 |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Tax effect on fair value of interest rate swap agreements |  | $ 5,083 |

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