Consolidated Statement of Stockholders' Equity and Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands | 9 Months Ended | |
|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | |
| Consolidated Statement of Stockholders' Equity and Comprehensive Income (Loss) | ||
| Unrealized gain on derivatives designated and qualified as cash flow hedges, tax | $ 2,718 | $ 1,367 |