Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets
The following table presents the gross carrying amount and accumulated amortization of intangible assets as of December 31, 2015:
(In thousands, except weighted average amortization period)
 
Weighted Average Amortization Period
 
Gross Carrying Amount
 
Accumulated Amortization
 
Accumulated Currency Translation Adjustment
 
Net Book Value
In-place value of market rate revenue contracts
 
20 years
 
$
84,643

 
$
(1,632
)
 
$
(12,381
)
 
$
70,630