Annual report pursuant to Section 13 and 15(d)

Other Long-Term Liabilities (Schedule of Other Long-Term Liabilities) (Details)

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Other Long-Term Liabilities (Schedule of Other Long-Term Liabilities) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Other Liabilities Disclosure [Abstract]    
Straight-line and deferred rent liabilities $ 30,313,000 $ 26,992,000
Asset retirement obligations 2,972,000 2,404,000
Deferred compensation plan liability 6,887,000 6,039,000
Total other long-term liabilities $ 40,172,000 $ 35,435,000