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Significant Accounting Policies (Estimated Annual Amortization and Revenue Recognition)(Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Revenue Recognition  
Period after which payments become due (days) 90 days
Lease Agreements  
Finite-Lived Intangible Assets [Line Items]  
2016 $ 3,017
2017 4,994
2018 6,548
2019 7,128
2020 6,919
Other Identifiable Assets  
Finite-Lived Intangible Assets [Line Items]  
2016 4,600
2017 3,326
2018 2,177
2019 1,751
2020 $ 1,588