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Debt - Senior Notes - Narrative (Details) - USD ($) | Mar. 31, 2017 | Apr. 29, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 01, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt financing costs |  |  | $ 900,000 | $ 17,200,000 |  | $ 1,500,000 | $ 200,000
Unsecured Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate |  | 5.50% |  |  | 6.50% |  |
Purchase price percentage if debt covenants are not certified |  | 100.00% |  |  |  |  |
Legal fees | $ 100,000 |  |  |  |  |  |
Consent fee | $ 200,000 |  | 200,000 | 300,000.0 | $ 300,000 | 0 |
Unsecured Senior Notes | 5.50% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 55,000,000.0 |  |  |  |  |
Debt instrument, interest rate |  | 5.50% |  |  |  |  |
Proceeds from issuance of long-term debt |  | $ 53,500,000 |  |  |  |  |
Debt financing costs |  | $ 1,500,000 |  |  |  |  |
Accrued unpaid interest |  |  | $ 600,000 | $ 600,000 |  | $ 500,000 |
Unsecured Senior Notes | 5.50% Senior Notes | Before May 1, 2016 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  | 101.00% |  |  |  |  |
Unsecured Senior Notes | 5.50% Senior Notes | May 1, 2016 through October 31, 2016 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  | 101.00% |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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