Share-based Compensation Plans - Number of Plans (Details)	12 Months Ended
	Dec. 31, 2016 plan shares
Summary of the expenses the Company has recognized related to share-based compensation
Shares counted against plan (ratio)	2
Aggregate number of shares that may be granted during any calendar year per individual	250,000
2015 Equity Incentive Plan
Summary of the expenses the Company has recognized related to share-based compensation
Number of share-based employee compensation plans | plan	1
Maximum number of shares that may be issued	2,500,000
2005 Plan
Summary of the expenses the Company has recognized related to share-based compensation
Number of share-based employee compensation plans | plan	1
Number of Shares
Granted (in shares)	0