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Convertible Notes (Schedule of Notes) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 16, 2013 | Jul. 10, 2009 | Jun. 29, 2009
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Other assets | $ 2,749 | $ 2,165 |  |  |
Total convertible notes | 126,167 | 119,418 |  |  |
Less current portion | 0 | 0 |  |  |
Total long-term convertible notes | 126,167 | 119,418 |  |  |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Value | 138,000 | 138,000 | $ 138,000 |  |
Unamortized discount | (10,913) | (17,099) |  |  |
Unamortized Debt Issuance Expense | $ 920 | 1,483 |  |  |
Convertible notes | 5% Convertible Senior Notes due 2014 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Value |  |  |  | $ 22,500 | $ 150,000
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other assets |  | 2,165 |  |  |
Total long-term convertible notes |  | 119,418 |  |  |
Adjustments for New Accounting Pronouncement [Member] | Scenario, Previously Reported [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other assets |  | 3,648 |  |  |
Total long-term convertible notes |  | 120,901 |  |  |
Adjustments for New Accounting Pronouncement [Member] | Scenario, Adjustment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other assets |  | (1,483) |  |  |
Total long-term convertible notes |  | $ (1,483) |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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