Assets Held for Sale	12 Months Ended
Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Assets Held for Sale	Assets Held for Sale In June 2016, the Company approved the divestiture of the solar power assets of Bit-isle. In October 2016, the Company entered into a Share Transfer Agreement for the transfer of common stock of Terra Power Co., Ltd., relating to the divestiture of the solar power assets of Bit-isle. The Company received ¥400.0 million upon the closing of the transaction, or approximately $3.8 million at the exchange rate in effect on October 31, 2016. In November 2016, the Company had received an additional ¥2,500.0 million, or approximately $22.1 million at the exchange rate in effect at the time of receipt. The Company received the remaining payment of ¥5,313.4 million in the first quarter of 2017, or approximately $47.8 million at the exchange rate in effect on March 31, 2017. During the three months ended September 30, 2016, the Company evaluated the recoverability of the carrying value of its assets held for sale related to the sales agreement signed in October, as discussed above, and concluded that the Company would not recover the carrying value of certain assets. Accordingly, the Company recorded an impairment charge on other current assets of $7.7 million at September 30, 2016, reducing the carrying value of such assets from $79.5 million to the estimated fair value of $71.8 million. The associated loss on the sale was not significant. Furthermore, the revenue and net income generated by the solar power assets of Bit-isle during the years ended December 31, 2016 and 2015 were not significant. During the fourth quarter of 2015, the Company and TelecityGroup agreed to divest certain data centers, including the Company’s London 2 ("LD2") data center and certain data centers of TelecityGroup in the United Kingdom, Netherlands and Germany, in order to obtain the approval of the European Commission for the acquisition of TelecityGroup. The assets and liabilities of LD2 were classified as held for sale in the fourth quarter of 2015 and, therefore, the corresponding depreciation and amortization expense was ceased at that time. This divestiture was not presented as discontinued operations in the consolidated statements of operations, because it did not represent a strategic shift in the Company's business, as the Company continued operating similar businesses after the divestiture. The assets and liabilities of data centers from TelecityGroup were classified as held for sale on January 15, 2016, upon close TelecityGroup acquisition. The divestiture of these data centers was completed on July 5, 2016. The Company recognized a gain on the sale of LD2 data center of $27.9 million in gains on asset sales in the consolidated statements of operations for the year ended December 31, 2016. During the years ended December 31, 2016 and 2015, the LD2 data center generated revenue of $6.1 million and $17.6 million, respectively, and net income of $2.3 million and $7.2 million, respectively. The results of operations for the TelecityGroup data centers that were divested, as well as the gain on divestiture, were classified as discontinued operations from January 15, 2016, the date the acquisition closed, through July 5, 2016 (see Note 5). During the fourth quarter of 2015, the Company entered into an agreement to sell a parcel of land in San Jose, California. The sale was completed in February 2016 and the Company recognized a gain on sale of $5.2 million.

Assets Held for Sale

In June 2016, the Company approved the divestiture of the solar power assets of Bit-isle. In October 2016, the Company entered into a Share Transfer Agreement for the transfer of common stock of Terra Power Co., Ltd., relating to the divestiture of the solar power assets of Bit-isle. The Company received ¥400.0 million upon the closing of the transaction, or approximately $3.8 million at the exchange rate in effect on October 31, 2016. In November 2016, the Company had received an additional ¥2,500.0 million, or approximately $22.1 million at the exchange rate in effect at the time of receipt. The Company received the remaining payment of ¥5,313.4 million in the first quarter of 2017, or approximately $47.8 million at the exchange rate in effect on March 31, 2017. During the three months ended September 30, 2016, the Company evaluated the recoverability of the carrying value of its assets held for sale related to the sales agreement signed in October, as discussed above, and concluded that the Company would not recover the carrying value of certain assets. Accordingly, the Company recorded an impairment charge on other current assets of $7.7 million at September 30, 2016, reducing the carrying value of such assets from $79.5 million to the estimated fair value of $71.8 million. The associated loss on the sale was not significant. Furthermore, the revenue and net income generated by the solar power assets of Bit-isle during the years ended December 31, 2016 and 2015 were not significant.

During the fourth quarter of 2015, the Company and TelecityGroup agreed to divest certain data centers, including the Company’s London 2 ("LD2") data center and certain data centers of TelecityGroup in the United Kingdom, Netherlands and Germany, in order to obtain the approval of the European Commission for the acquisition of TelecityGroup. The assets and liabilities of LD2 were classified as held for sale in the fourth quarter of 2015 and, therefore, the corresponding depreciation and amortization expense was ceased at that time. This divestiture was not presented as discontinued operations in the consolidated statements of operations, because it did not represent a strategic shift in the Company's business, as the Company continued operating similar businesses after the divestiture. The assets and liabilities of data centers from TelecityGroup were classified as held for sale on January 15, 2016, upon close TelecityGroup acquisition. The divestiture of these data centers was completed on July 5, 2016. The Company recognized a gain on the sale of LD2 data center of $27.9 million in gains on asset sales in the consolidated statements of operations for the year ended December 31, 2016. During the years ended December 31, 2016 and 2015, the LD2 data center generated revenue of $6.1 million and $17.6 million, respectively, and net income of $2.3 million and $7.2 million, respectively. The results of operations for the TelecityGroup data centers that were divested, as well as the gain on divestiture, were classified as discontinued operations from January 15, 2016, the date the acquisition closed, through July 5, 2016 (see Note 5).

During the fourth quarter of 2015, the Company entered into an agreement to sell a parcel of land in San Jose, California. The sale was completed in February 2016 and the Company recognized a gain on sale of $5.2 million.