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Shareholders' Equity (Deficit) (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of information relating to common stock activity
The following table sets forth information relating to common stock activity for the years ended December 31, 2018, 2017, and 2016:
Balance of outstanding shares, December 31, 2015
70,533,515

Stock options exercised
745,938

Shares issued
110,953

Shares forfeited
(305,678
)
Shares repurchased
(2,775,297
)
Balance of outstanding shares, December 31, 2016
68,309,431

Stock options exercised
386,300

Shares issued
49,897

Shares forfeited through net share exercise
(29,783
)
Shares repurchased
(935,435
)
Balance of outstanding shares, December 31, 2017
67,780,410

Stock options exercised
243,502

Shares issued
72,590

Shares forfeited through net share exercise
(132,393
)
Shares repurchased
(1,171,141
)
Balance of outstanding shares, December 31, 2018
66,792,968