Earnings Per Share (Narrative) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Stock options to purchase shares (in shares)	599,889		599,889		1,406,371
Diluted shares outstanding (in shares)	2,315,145	2,898,633	3,036,349	3,355,780
Common stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Stock options to purchase shares (in shares)	599,889	1,574,659	599,889	1,574,659
Diluted shares outstanding (in shares)	420,677		331,072
Restricted stock and PSU's
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Stock options to purchase shares (in shares)	3,443,864	4,519,995	3,443,864	4,519,995
Diluted shares outstanding (in shares)	3,437,639	4,135,696	2,926,602	3,864,478