Operating Leases (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2016 | |||||||||||||||||||||||||||||||||||||||||
| Leases, Operating [Abstract] | |||||||||||||||||||||||||||||||||||||||||
| Future minimum lease payments under operating leases | For each of the next five calendar years and thereafter, future minimum lease payments under operating leases that have initial or remaining noncancelable lease terms in excess of one year are as follows:
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