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Organization and Summary of Significant Accounting Policies - Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Identifiable intangible assets, net  
Balance at the beginning of the period $ 85,941
Amortization (2,688)
Balance at the end of the period 83,253
Customer Relationships
  
Identifiable intangible assets, net  
Balance at the beginning of the period 71,388
Amortization (2,051)
Balance at the end of the period 69,337
Customer Relationships | Minimum
  
Identifiable intangible assets, net  
Amortization period of identifiable intangible asset 20 years
Customer Relationships | Maximum
  
Identifiable intangible assets, net  
Amortization period of identifiable intangible asset 30 years
Trade Names
  
Identifiable intangible assets, net  
Balance at the beginning of the period 13,728
Amortization (468)
Balance at the end of the period 13,260
Trade Names | Minimum
  
Identifiable intangible assets, net  
Amortization period of identifiable intangible asset 20 years
Trade Names | Maximum
  
Identifiable intangible assets, net  
Amortization period of identifiable intangible asset 30 years
Non-compete
  
Identifiable intangible assets, net  
Balance at the beginning of the period 825
Amortization (169)
Balance at the end of the period $ 656
Amortization period of identifiable intangible asset 4 years