Short-Term Investments	12 Months Ended
Dec. 31, 2016
Short-term Investments [Abstract]
Short-Term Investments	Short-Term Investments At December 31, 2016 and 2015, we had $89.3 million and $127.1 million, respectively, of loan receivables and commercial paper due from financial institutions. These loan receivables and commercial paper are non-derivative financial assets with fixed or determinable payments that are not quoted in an active market and are carried at fair market value, which is equal to the cost. At December 31, 2016, these loans consist of $63.5 million and €24.5 million ($25.8 million as of December 31, 2016) which mature at various dates through December 2018. All instruments that have an original tenor of more than 12 months include redemption rights on at least a quarterly basis. Interest income is determined using the effective interest rate method. These loans are classified as current assets in the accompanying consolidated balance sheets since we may redeem the loans at our discretion. At December 31, 2016 and 2015, we also had €3.5 million ($3.7 million) and €3.4 million ($3.7 million), respectively in term deposits with final maturities in August 2017. The deposits can be withdrawn at the end of each quarter without penalty and are therefore classified as current assets in the accompanying consolidated balance sheets. For the year ended December 31, 2016 and 2015, proceeds from sales of short term investments totaled $533.8 million and $367.7 million, respectively. During the year ended December 31, 2016, realized gains totaled $1.4 million. During the years ended December 31, 2015 and 2014, realized losses totaled $6.0 million and $3.9 million, respectively.

Short-Term Investments

At December 31, 2016 and 2015, we had $89.3 million and $127.1 million, respectively, of loan receivables and commercial paper due from financial institutions. These loan receivables and commercial paper are non-derivative financial assets with fixed or determinable payments that are not quoted in an active market and are carried at fair market value, which is equal to the cost. At December 31, 2016, these loans consist of $63.5 million and €24.5 million ($25.8 million as of December 31, 2016) which mature at various dates through December 2018. All instruments that have an original tenor of more than 12 months include redemption rights on at least a quarterly basis. Interest income is determined using the effective interest rate method. These loans are classified as current assets in the accompanying consolidated balance sheets since we may redeem the loans at our discretion.

At December 31, 2016 and 2015, we also had €3.5 million ($3.7 million) and €3.4 million ($3.7 million), respectively in term deposits with final maturities in August 2017. The deposits can be withdrawn at the end of each quarter without penalty and are therefore classified as current assets in the accompanying consolidated balance sheets.

For the year ended December 31, 2016 and 2015, proceeds from sales of short term investments totaled $533.8 million and $367.7 million, respectively. During the year ended December 31, 2016, realized gains totaled $1.4 million. During the years ended December 31, 2015 and 2014, realized losses totaled $6.0 million and $3.9 million, respectively.