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Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions During the three and six months ended June 30, 2018, NSP China borrowed $0 and $2.0 million from the Company and $0 and $0.5 million the Company's joint venture partner, respectively. These notes are payable in one year and bear interest of 3.0 percent. As of June 30, 2018 and December 31, 2017 outstanding borrowings by NSP China from the Company were $4.1 million and $2.0 million, respectively. As of June 30, 2018 and December 31, 2017 outstanding borrowings by NSP China from the Company's joint venture partner were $1.0 million and $0.5 million, respectively. The notes between NSP China and the Company eliminate in consolidation.