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Fair Value Measurements and Derivative Instruments (Available-for-sale Securities Maturities) (Details)
$ in Thousands
Jun. 30, 2016
USD ($)
Fair Value Disclosures [Abstract]  
Amortized cost - Within 1 year $ 65,899
Amortized cost - After 1 year through 5 years 68,381
Amortized cost - After 5 years through 10 years 55,584
Amortized cost - After 10 years 162,858
Amortized cost - Total 352,722
Estimated fair value - Within 1 year 65,988
Estimated fair value - After 1 year through 5 years 70,249
Estimated fair value - After 5 years through 10 years 57,985
Estimated fair value - After 10 years 168,618
Estimated fair value - Total $ 362,840