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Basis of Presentation and General Information (Narrative) (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 1 Months Ended 2 Months Ended 12 Months Ended
Dec. 10, 2014
$ / shares
Dec. 31, 2013
$ / shares
Dec. 31, 2012
$ / shares
Mar. 14, 2016
$ / shares
Jan. 01, 2016
USD ($)
segment
customer
$ / shares
shares
Dec. 31, 2015
$ / shares
Jan. 02, 2015
USD ($)
customer
shares
Dec. 31, 2014
$ / shares
Dec. 27, 2013
USD ($)
customer
shares
Basis Of Presentation And General Information [Line Items]                  
Annual cash dividend per share | $ / shares $ 0.12 $ 0.10 $ 0.10            
Amortization expense         $ 2,207   $ 2,212   $ 602
Dividend declared | $ / shares     $ 0.10   $ 0.20 $ 0.20   $ 0.12  
Annual dividend | $ / shares       $ 0.26          
Period of intangible assets amortized         5 years        
Future amortization expense, 2016         $ 1,100        
Future amortization expense, 2017         1,300        
Future amortization expense, 2018         $ 1,400        
Common stock excluded from reconciliation | shares         0.5   0.3   0.8
Number of customers accounted for more than five percent of revenue | customer         0   0   0
Number of operating segments | segment         1        
Amount reclassified from cash flows from operations to cash flows from financing activities         $ 2,700   $ 1,200    
Amount reclassified from current deferred tax asset net to non-current deferred tax liability         $ 500   $ 2,800    
Minimum [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Useful life of property and equipments         3 years        
Provisions apply to specific employees         6 months        
Maximum [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Useful life of property and equipments         10 years        
Provisions apply to specific employees         12 months        
Subsequent Event [Member]                  
Basis Of Presentation And General Information [Line Items]                  
Annual dividend | $ / shares       $ 0.26