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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2
Jun. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3
Mar. 31, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3
Jun. 30, 2013
Contingent Consideration Liabilities
Levels of fair value measurements of financial assets:                      
Cash equivalents       $ 1,004   $ 1,004   $ 0   $ 0  
Restricted cash 6,753 6,751 6,753 6,751 6,753 6,751 0 0 0 0  
Interest rate derivatives (131) (544) (131) (544) 0 0 (131) (544) 0 0  
Contingent consideration     (3,287) (3,250) 0 0 0 0 (3,287) (3,250)  
Financial assets     3,335 3,961 6,753 7,755 (131) (544) (3,287) (3,250)  
Contingent consideration liabilities [Roll Forward]                      
Fair value, contingent consideration                     3,250
Change in fair value                     37
Fair value, contingent consideration                     $ 3,287