2013 | 2012 (1) | ||||||
Prepaid operating ground leases | $ | 82,950 | $ | 56,916 | |||
Value added tax and other consumption tax receivables | 78,262 | 22,443 | |||||
Prepaid income tax | 52,612 | 57,665 | |||||
Prepaid assets | 34,243 | 19,037 | |||||
Unbilled receivables | 25,412 | 32,588 | |||||
Other miscellaneous current assets | 40,588 | 34,350 | |||||
Balance as of December 31, | $ | 314,067 | $ | 222,999 |