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Schedule of Long-Term Obligations (Parenthetical) (Details)
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Sep. 30, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|---|
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Notes Payable
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| Debt Instrument | |||
| Weighted average interest rates | 1.80% | 1.70% | 2.00% |
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Other Long Term Debt
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| Debt Instrument | |||
| Weighted average interest rates | 3.50% | 3.30% | 3.20% |