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Commitments and Contingencies (Tables)
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12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2014
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| Commitments and Contingencies Disclosure [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Future Minimum Rental Payments for Operating Leases | Atlas has the following future minimum rentals, related principally to office space, required under operating leases having initial or remaining noncancelable lease terms in excess of one year as of December 31, 2014 (all amounts in '000s):
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