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Non-Controlling Interest Non-Controlling Interest (Schedule of Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Noncontrolling Interest [Line Items] |  |  |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  |  | $ (4,806)
Common Stock, Dividends, Per Share, Cash Paid | $ 0.18 | $ 0.17 | $ 0.36 | $ 0.34
Balance, beginning of period |  |  | $ 1,581,511 | $ 1,415,813
Net income (loss) | $ (11,316) | $ (7,873) | 27,569 | 26,321
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities | (4) | 4 | 0 | 2
Derivative holding losses | (6,157) | (920) | (7,762) | (9,424)
Foreign currency translation adjustments | 7,182 | 315 | 18,684 | 18,836
Cash dividends |  |  | (25,046) | (23,689)
Issuance of common stock under employee stock plans, net |  |  | 7,067 | 9,102
Stock-based compensation expense |  |  | 5,719 | 5,453
Stock Repurchased During Period, Value | (2,542) |  | (35,542) |
Balance, end of period | $ 1,572,200 | $ 1,437,608 | $ 1,572,200 | 1,437,608
Parent [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  |  | $ (4,806)
Common Stock, Dividends, Per Share, Cash Paid | $ 0.18 | $ 0.17 | $ 0.36 | $ 0.34
Balance, beginning of period |  |  | $ 1,560,820 | $ 1,399,800
Net income (loss) |  |  | 24,471 | 23,598
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities |  |  |  | 2
Derivative holding losses |  |  | (7,567) | (9,424)
Foreign currency translation adjustments |  |  | 16,888 | 19,485
Cash dividends |  |  | (25,046) | (23,689)
Issuance of common stock under employee stock plans, net |  |  | 7,067 | 9,102
Stock-based compensation expense |  |  | 5,719 | 5,453
Stock Repurchased During Period, Value |  |  | (35,542) |
Balance, end of period | $ 1,546,810 | $ 1,419,521 | 1,546,810 | 1,419,521
Non-controlling Interest [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  |  | 0
Balance, beginning of period |  |  | 20,691 | 16,013
Net income (loss) |  |  | 3,098 | 2,723
Other comprehensive income (loss): |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities |  |  |  | 0
Derivative holding losses |  |  | (195) | 0
Foreign currency translation adjustments |  |  | 1,796 | (649)
Cash dividends |  |  | 0 | 0
Issuance of common stock under employee stock plans, net |  |  | 0 | 0
Stock-based compensation expense |  |  | 0 | 0
Stock Repurchased During Period, Value |  |  | 0 |
Balance, end of period | $ 25,390 | $ 18,087 | $ 25,390 | $ 18,087

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