CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY [Abstract]
Unrealized gains on investment, tax expense	$ 15	$ 112
Reclassification adjustment for unrealized gains on investments, tax expense	95	309
Reclassification of realized gains on sales of investments to earnings, tax expense	95	309
Reclassifications of net losses on swap derivatives to earnings, tax benefit		$ 349

Tax effect of the income statement impact of the reclassification adjustment for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Tax effect of the income statement impact of the reclassification adjustment for unrealized (losses) realized upon the write-down of available-for-sale securities.

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- Definition

Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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- Definition

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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