Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, asset | $ 0 | $ 210 |
Derivative financial instruments, liability | 764 | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, asset | | 0 |
Derivative financial instruments, liability | 0 | |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, asset | | 210 |
Derivative financial instruments, liability | 764 | |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, asset | | 0 |
Derivative financial instruments, liability | 0 | |
Fair Value, Measurements, Recurring | Marketable securities - deferred compensation plan | Quoted Prices in Active Markets (Level 1) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale securities | 0 | 0 |
Marketable securities liability | 0 | 0 |
Fair Value, Measurements, Recurring | Marketable securities - deferred compensation plan | Significant Other Observable Inputs (Level 2) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale securities | 45,896 | 45,254 |
Marketable securities liability | 41,515 | 43,568 |
Fair Value, Measurements, Recurring | Marketable securities - deferred compensation plan | Significant Unobservable Inputs (Level 3) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale securities | 0 | 0 |
Marketable securities liability | 0 | 0 |
Fair Value, Measurements, Recurring | Marketable securities - other | Quoted Prices in Active Markets (Level 1) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale securities | 2,891 | 2,387 |
Fair Value, Measurements, Recurring | Marketable securities - other | Significant Other Observable Inputs (Level 2) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale securities | 0 | 0 |
Fair Value, Measurements, Recurring | Marketable securities - other | Significant Unobservable Inputs (Level 3) | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale securities | 0 | 0 |
Fair Value | Fair Value, Measurements, Recurring | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative financial instruments, asset | | 210 |
Derivative financial instruments, liability | 764 | |
Fair Value | Fair Value, Measurements, Recurring | Marketable securities - deferred compensation plan | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale securities | 45,896 | 45,254 |
Marketable securities liability | 41,515 | 43,568 |
Fair Value | Fair Value, Measurements, Recurring | Marketable securities - other | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale securities | $ 2,891 | $ 2,387 |