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Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Option to purchase noncontrolling interest impairment charge |  | $ 0 |  |  |  |
Beginning Balance |  | 62,886,000 |  | $ 62,886,000 |  |
Redemptions | $ 0 |  | $ (11,947,000) | 26,191,000 |  |
Granted |  |  |  |  | $ 11,947,000 |
Changes in redemption value |  |  |  | (5,965,000) |  |
Ending Balance | 55,730,000 |  |  | 55,730,000 |  | $ 62,886,000
Redeemable Noncontrolling Interest |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Beginning Balance |  | $ 62,886,000 |  | 62,886,000 | $ 60,180,000 | 60,180,000
Redemptions |  |  |  | (8,858,000) |  | (910,000)
Granted |  |  |  | 0 |  | 1,666,000
Changes in redemption value |  |  |  | 2,062,000 |  | 1,498,000
Currency translation adjustments |  |  |  | (360,000) |  | 452,000
Ending Balance | $ 55,730,000 |  |  | $ 55,730,000 |  | $ 62,886,000

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- Definition Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 16(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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