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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 |  |  |  |  |

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