Fair Value Measurements	3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company records certain financial instruments at fair value in accordance with the hierarchy from the Fair Value Measurements and Disclosures Topic of the FASB ASC as follows. Fair Value of Assets Level 1: Observable inputs such as quoted prices in active markets for identical assets. Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active. Level 3: Unobservable inputs that reflect the reporting entity’s own assumptions. The Company records pension assets at fair value. As of the last fair value measurement date of December 31, 2017, the net pension asset included plan assets with a fair value of $43.4 million. The plan assets consisted of debt and equity securities, real estate investment funds and cash and cash equivalents. The fair values of debt and equity securities are determined based on quoted prices in active markets for identical assets, which are Level 1 inputs under the fair value hierarchy. The fair value measurement of the real estate investment funds is based on net asset value which is excluded from the fair value hierarchy. As of March 31, 2018 and December 31, 2017, the fair value of the Company’s convertible senior notes issued in September and October 2017 was approximately $52.8 million and $52.6 million, respectively, and was measured using Level 2 inputs. The carrying value of other short-term and long-term borrowings approximates fair value because of the relative short maturity of these instruments and the interest rates the Company could currently obtain.

Fair Value Measurements

The Company records certain financial instruments at fair value in accordance with the hierarchy from the Fair Value Measurements and Disclosures Topic of the FASB ASC as follows.

Fair Value of Assets

Level 1: Observable inputs such as quoted prices in active markets for identical assets.

Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.

Level 3: Unobservable inputs that reflect the reporting entity’s own assumptions.

The Company records pension assets at fair value. As of the last fair value measurement date of December 31, 2017, the net pension asset included plan assets with a fair value of $43.4 million. The plan assets consisted of debt and equity securities, real estate investment funds and cash and cash equivalents. The fair values of debt and equity securities are determined based on quoted prices in active markets for identical assets, which are Level 1 inputs under the fair value hierarchy. The fair value measurement of the real estate investment funds is based on net asset value which is excluded from the fair value hierarchy.

As of March 31, 2018 and December 31, 2017, the fair value of the Company’s convertible senior notes issued in September and October 2017 was approximately $52.8 million and $52.6 million, respectively, and was measured using Level 2 inputs. The carrying value of other short-term and long-term borrowings approximates fair value because of the relative short maturity of these instruments and the interest rates the Company could currently obtain.