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Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Class of Stock [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | $ 1,059,684 | $ 1,101,330 | $ 1,248,348 | $ 1,301,465
Accumulated other comprehensive income (loss) |  |  |  |
Class of Stock [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | (4,218) | (4,851) | $ (971) | $ (4,276)
Unrealized gains (losses) on available-for-sale securities |  |  |  |
Class of Stock [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | 149 | (125) |  |
Unrealized gains (losses) on cash flow hedges |  |  |  |
Class of Stock [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | 27 | (690) |  |
Unrealized losses on cumulative translation adjustment |  |  |  |
Class of Stock [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | $ (4,394) | $ (4,036) |  |

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