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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Long-term Debt      
Transfers between Levels 1 and 2, description The Company did not have transfers between Levels 1 and 2 for either financial assets or liabilities, during the three and six months ended June 30, 2016 or 2015.    
Transfers between Levels 1 and 2, amount $ 0 $ 0  
Long-term debt, carrying amount 800,521   $ 817,684
Proceeds from Convertible Debt 200,000  
Senior Notes [Member]      
Long-term Debt      
Long-term debt, fair value 303,400   305,600
Long-term debt, carrying amount 297,616   297,118
Convertible Notes [Member]      
Long-term Debt      
Long-term debt, fair value 208,900    
Long-term debt, carrying amount 148,606  
Liability Component [Member] | Convertible Notes [Member]      
Long-term Debt      
Proceeds from Convertible Debt $ 153,200