Organization and Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated other comprehensive income (loss), interest rate swaps, net of tax	$ (1,100,000)
Accumulated other comprehensive income (loss), interest rate swap, tax benefit	696,000
Accumulated other comprehensive income (loss) related to foreign currency translation, net of tax	(89,000)	(30,000)
Accumulated other comprehensive income (loss), foreign currency translation, tax benefit	7,000
Accumulated other comprehensive income (loss), marketable securities, net of tax		180,000
Accumulated other comprehensive income (Loss), marketable securities, tax		$ 115,000