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Commitments and Contingencies (Future Minimum Rental Commitments Under Non-Cancelable Leases) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Operating Leases  
2017 $ 149,364
2018 130,990
2019 110,800
2020 94,532
2021 80,487
Thereafter 233,684
Total 799,857
Capital Leases  
2017 1,435
2018 1,146
2019 926
2020 923
2021 917
Thereafter 230
Total 5,577
Less amounts representing interest at 3.0% to 10.8% 159
Capital lease obligations $ 5,418
Minimum  
Other Commitments [Line Items]  
Percent of interest included in capital leases payments 0.03
Maximum  
Other Commitments [Line Items]  
Percent of interest included in capital leases payments 0.108