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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Income Statement [Abstract] |  |  |  |
Interest expense, related party interest | $ 0 | $ 59 | $ 0 | $ 118

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Amount of interest expense incurred on a debt or other obligation to related party. + References No definition available. + Details
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