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Financing Arrangements Revolving Credit Agreement (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Apr. 04, 2016
Line of Credit Facility [Line Items] |  |  |  |  |  |
Interest Expense, Debt, Excluding Amortization | $ 2,032,000 | $ 2,032,000 | $ 6,096,000 | $ 4,063,000 |  |
Cash Institution Covenant | 200,000,000 |  | 200,000,000 |  |  |
Proceeds from Lines of Credit |  |  | 0 | 0 |  |
Line of Credit Facility, Maximum Borrowing Capacity | 250,000,000 |  | 250,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 3.25%
Unrestricted Cash Covenant | 400,000,000 |  | 400,000,000 |  |  |
Letters of Credit Outstanding, Amount | 16,500,000 |  | 16,500,000 |  | $ 11,100,000 |
Amortization of Debt Discount (Premium) | 2,722,000 | 2,458,000 | 7,964,000 | 4,854,000 |  |
Interest Expense, Debt | 4,754,000 | $ 4,490,000 | 14,060,000 | $ 8,917,000 |  |
Letter of Credit [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 45,000,000 |  | $ 45,000,000 |  |  |
Minimum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.25% |  |  |
Maximum [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  |  | 0.40% |  |  |
Geographic Distribution, Domestic [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Securities Owned and Pledged as Collateral, Description | 1 |  |  |  |  |
Geographic Distribution, Foreign [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Securities Owned and Pledged as Collateral, Description | 0.65 |  |  |  |  |
Base Rate [Member] | Minimum [Member] | Letter of Credit [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.50% |  | 0.50% |  |  |
Base Rate [Member] | Maximum [Member] | Letter of Credit [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.25% |  | 2.25% |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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