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Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, at amortized cost | $ 327,268 | $ 347,615 | $ 356,910
Operating leases (less than) | 2,300 |  |
Equity Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, at amortized cost | 1,120 | $ 1,120 | $ 1,120
Accounting Standards Update 2016-09 |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Effect of change on net income | $ 112 |  |
Effect of change on earnings per share (in usd per share) | $ 0.01 |  |
Fair Value, Measurements, Recurring | Equity Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, at amortized cost | $ 1,490 |  |

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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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