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Derivative Instruments (Narrative) (Details) $ / shares in Units, BRL in Millions |  |  | 2 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Nov. 13, 2015 USD ($) | Sep. 23, 2014 USD ($) | Sep. 30, 2015 USD ($) shares | Dec. 31, 2015 USD ($) amendment shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Nov. 13, 2015 BRL | Nov. 13, 2015 USD ($) | Sep. 30, 2014 | Nov. 07, 2013 USD ($) | Oct. 04, 2013 USD ($) | Aug. 31, 2013 | Dec. 31, 2012 shares | Aug. 20, 2012 $ / shares shares | Apr. 24, 2012 BRL | Apr. 24, 2012 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock | shares |  |  |  | 210,538,896 | 210,216,043 | 209,867,426 |  |  |  |  |  |  | 209,529,412 |  |  |
Collateral deposits, minimum threshold |  | $ 3,000,000 |  | $ 0 | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Collateral deposit, incremental payments |  | $ 500,000 |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Collateral deposits |  |  |  | $ 0 | 4,832,000 |  |  |  |  |  |  |  |  |  |  |
Number of amendments to conditions of collateral deposit | amendment |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  | $ 64,229,000 | $ 71,369,000 | $ 61,771,000 |  |  |  |  |  |  |  |  |  |
Class A Shares Of Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock | shares |  |  |  | 130,538,896 | 130,216,043 | 129,867,426 |  |  |  |  |  |  | 129,529,412 |  |  |
Total Equity Return Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest paid related to derivative instruments |  |  |  | $ 522,000 | $ 593,000 | $ 746,000 |  |  |  |  |  |  |  |  |  |
Total Equity Return Swap [Member] | Class A Shares Of Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock | shares |  |  |  |  |  | 1,250,000 |  |  |  |  |  |  |  | 2,272,551 |  |
Appreciation (depreciation) receives (pays) plus dividends per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.77 |  |
Notional amount of derivative |  |  |  |  |  | $ 17,211,000 |  |  |  |  |  |  |  |  |  |
Settlement payment for share reductions |  |  | $ 9,681,000 |  |  | 1,731,000 |  |  |  |  |  |  |  |  |  |
Notional amount (in shares) | shares |  |  | 1,022,551 |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net collections (payments) to derivative instrument hedges |  |  |  | 2,306,000 | 1,451,000 | 628,000 |  |  |  |  |  |  |  |  |  |
Bank Of America, N.A. [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,433,000
Interest rate of derivative instrument (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.90% | 4.90%
Amount of swap agreement settled |  |  |  |  |  |  |  |  |  |  | $ 9,975,000 |  |  |  |  |
Loss from early settlement |  |  |  |  |  | 4,187,000 |  |  |  |  |  |  |  |  |  |
Net interest received from counterparty |  |  |  |  |  | 1,828,000 |  |  |  |  |  |  |  |  |  |
Bank Of America, N.A. [Member] | 2016 Notes [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative | BRL |  |  |  |  |  |  |  |  |  |  |  |  |  |  | BRL 70 |
Interest rate of derivative instrument (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.25% | 10.25%
JP Morgan Chase Bank, N.A. [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  |  | BRL 108 | $ 28,300,000 |  | $ 47,300,000 |  |  |  |  |  |
Collateral deposits, minimum threshold |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |
Collateral deposit, incremental payments | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of derivative instrument (as a percent) |  |  |  |  |  |  | 4.38% | 4.38% |  |  |  |  |  |  |  |
Percentage of principal and interest collections hedged (as a percent) |  |  |  |  |  |  |  |  |  | 53.08% |  |  |  |  |  |
Proceeds from amendment of derivative instrument agreement | 19,817,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on amendment to derivative instrument agreement | 2,650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred amount in accumulated other comprehensive income | $ 6,666,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  | 1,933,000 | 3,512,000 |  |  |  |  |  |  |  |  |  |  |
Brazil Real [Member] | JP Morgan Chase Bank, N.A. [Member] | Cross-Currency Interest Rate Swaps [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of derivative instrument (as a percent) |  |  |  |  |  |  | 13.00% | 13.00% |  |  |  |  |  |  |  |
Derivatives Designated As Hedging Instruments [Member] | Forward Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  | 12,375,000 | $ 30,454,000 | $ 17,633,000 |  |  |  |  |  |  |  |  |  |
Notional amount outstanding |  |  |  | $ 10,240,000 |  |  |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Total Equity Return Swap [Member] | Class A Shares Of Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis point spread on variable rate (as a percent) |  |  |  | 4.50% |  |  |  |  | 3.80% |  |  | 3.30% |  |  |  |

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