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Changes in Stockholders' Equity (Narrative) (Details)
Jun. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock repurchase program, outstanding balance authorized to be repurchased $ 331,400,000
Stock repurchase program, value of remaining number of shares authorized to be repurchased 31,400,000
December 2016 ASR Program [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock repurchase program, authorized amount $ 300,000,000