Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Owned Assets:
Owned assets, gross	$ 184,242	$ 164,097
Less: Accumulated depreciation and amortization	(125,488)	(115,568)
Owned Assets, net	58,754	48,529
Assets under capital leases:
Capital leased assets, gross	1,930	1,797
Less: Accumulated depreciation and amortization	(1,464)	(1,297)
Assets under capital leases, net	466	500
Property, Plant and Equipment, net	59,220	49,029
Network equipment, computers and software
Owned Assets:
Owned assets, gross	124,938	109,998
Leasehold improvements
Owned Assets:
Owned assets, gross	33,038	31,192
Assets under capital leases:
Capital leased assets, gross	940	854
Office furniture and equipment
Owned Assets:
Owned assets, gross	16,162	15,426
Assets under capital leases:
Capital leased assets, gross	193	133
Motor vehicles
Owned Assets:
Owned assets, gross	602	580
Assets under capital leases:
Capital leased assets, gross	797	810
Buildings
Owned Assets:
Owned assets, gross	$ 1,226	1,171
Equipment useful life (in years)	30 years
Land
Owned Assets:
Owned assets, gross	$ 802	766
Capital work in progress
Owned Assets:
Owned assets, gross	$ 7,474	$ 4,964
Minimum | Network equipment, computers and software
Owned Assets:
Equipment useful life (in years)	3 years
Minimum | Leasehold improvements
Owned Assets:
Equipment useful life (in years)	3 years
Minimum | Office furniture and equipment
Owned Assets:
Equipment useful life (in years)	3 years
Minimum | Motor vehicles
Owned Assets:
Equipment useful life (in years)	2 years
Maximum | Network equipment, computers and software
Owned Assets:
Equipment useful life (in years)	5 years
Maximum | Leasehold improvements
Owned Assets:
Equipment useful life (in years)	8 years
Maximum | Office furniture and equipment
Owned Assets:
Equipment useful life (in years)	8 years
Maximum | Motor vehicles
Owned Assets:
Equipment useful life (in years)	5 years