Fair Value Measurements Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loan term	15 years
Convertible preferred securities | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Convertible Preferred Securities	16,720
Convertible preferred securities | Market Approach | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
EBITDA Multiples	6.6
Convertible preferred securities | Income Approach | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	17.50%
Convertible preferred securities | Minimum | Market Approach | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
EBITDA Multiples	5.5
Convertible preferred securities | Minimum | Income Approach | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	17.50%
Convertible preferred securities | Maximum | Market Approach | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
EBITDA Multiples	7.0
Convertible preferred securities | Maximum | Income Approach | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount Rate	17.50%