Fair Values (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible Debt Conversion Feature	$ 23,977,000	$ 30,708,000
Convertible note hedge asset	19,641,000	25,471,000
Convertible Debt Bond Hedge [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible note hedge asset	19,641,000	25,471,000
Forward exchange contracts—net | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets / (Liabilities) - Level I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	0	0
Forward exchange contracts—net | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	1,472,000	971,000
Forward exchange contracts—net | Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs - Level III
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	0	0
Convertible Debt Conversion Feature [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible Debt Conversion Feature	23,977,000	30,708,000
Convertible Debt Conversion Feature [Member] | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets / (Liabilities) - Level I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	0	0
Convertible Debt Conversion Feature [Member] | Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs - Level III
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	0	0
Convertible Debt Bond Hedge [Member] | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets / (Liabilities) - Level I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	0	0
Convertible Debt Bond Hedge [Member] | Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs - Level III
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair value, net	$ 0	$ 0