| Schedule II - Valuation and Qualifying Accounts Disclosure [Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Additions | | Deductions | | | | | | Balance at Beginning of Year | | Charged to Operations | | Acquired | | Credited to Operations | | Written Off | | Effect of Exchange Rate Changes | | Balance at End of Year | Allowance for Doubtful Accounts Receivable: | | | | | | | | | | | | | | 2011 | $ | 5,683 |
| | $ | 1,819 |
| | $ | — |
| | $ | — |
| | $ | (1,611 | ) | | $ | — |
| | $ | 5,891 |
| 2010 | $ | 5,497 |
| | $ | 1,829 |
| | $ | — |
| | $ | — |
| | $ | (1,669 | ) | | $ | 26 |
| | $ | 5,683 |
| 2009 | $ | 6,267 |
| | $ | 998 |
| | $ | — |
| | $ | — |
| | $ | (1,802 | ) | | $ | 34 |
| | $ | 5,497 |
| | | | Additions | | Deductions | | | | | | Balance at Beginning of Year | | Charged to Operations | | Acquired | | Credited to Operations | | Written Off | | Effect of Exchange Rate Changes | | Balance at End of Year | Allowance for Deferred Site Rental Receivables: | | | | | | | | | | | | | | 2011 | $ | 5,080 |
| | $ | — |
| | $ | — |
| | $ | (5,080 | ) | | $ | — |
| | $ | — |
| | $ | — |
| 2010 | $ | 3,600 |
| | $ | 7,200 |
| | $ | — |
| | $ | (5,720 | ) | | $ | — |
| | $ | — |
| | $ | 5,080 |
| 2009 | $ | — |
| | $ | 3,600 |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | 3,600 |
| | | | Additions | | Deductions | | | | | | Balance at Beginning of Year | | Charged to Operations | | Charged to Additional Paid-in Capital and Other Comprehensive Income | | Credited to Operations | | Credited to Additional Paid-in Capital and Other Comprehensive Income | | Other Adjustments(a) | | Balance at End of Year | Deferred Tax Valuation Allowance: | | | | | | | | | | | | | | 2011 | $ | 318,055 |
| | $ | — |
| | $ | — |
| | $ | (83,115 | ) | | $ | (22,119 | ) | | $ | 15,596 |
| | $ | 228,417 |
| 2010 | $ | 190,848 |
| | $ | 76,125 |
| | $ | 38,646 |
| | $ | — |
| | $ | — |
| | $ | 12,436 |
| | $ | 318,055 |
| 2009 | $ | 256,325 |
| | $ | — |
| | $ | — |
| | $ | (32,761 | ) | | $ | (45,657 | ) | | $ | 12,941 |
| | $ | 190,848 |
|
____________________ | | (a) | Inclusive of the effects of exchange rate changes. |
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