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Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 31, 2016 $ / shares | Mar. 31, 2016 $ / shares | Nov. 30, 2015 $ / shares | Aug. 31, 2015 $ / shares | May 31, 2015 $ / shares | Mar. 31, 2015 | Feb. 28, 2015 $ / shares | Apr. 30, 2016 USD ($) $ / shares | May 02, 2015 USD ($) $ / shares | Jan. 30, 2016 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  |  |  | 2 |  |  |  |
Cash dividends declared per share (in dollars per share) | $ / shares |  | $ 0.1350 | $ 0.1175 | $ 0.1175 | $ 0.1175 |  | $ 0.1175 | $ 0.1350 | $ 0.1175 |
Reclassification into long-term deferred tax liabilities |  |  |  |  |  |  |  | $ 140,801 | $ 72,786 | $ 130,088
Property, Plant and Equipment [Member] |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property and equipment purchased but not yet paid |  |  |  |  |  |  |  | $ 5,600 | 18,000 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per share (in dollars per share) | $ / shares | $ 0.1350 |  |  |  |  |  |  |  |  |
Accounting Standards Update 2015-17 [Member] |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Reclassification out of current deferred tax assets |  |  |  |  |  |  |  |  | 12,600 |
Reclassification into long-term deferred tax liabilities |  |  |  |  |  |  |  |  | $ 12,600 |

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