Share-Based Compensation (Summary of Restricted Share Activity) (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Time-Based
Number of Shares
Outstanding - beginning of year, number of shares | shares	344,932
Granted, number of shares | shares	72,500
Vested, number of shares | shares	(179,167)
Canceled or expired, number of shares | shares	(29,836)
Outstanding - end of year, number of shares | shares	208,429
Weighted Average Grant Date Fair Value
Outstanding - beginning of year, weighted average grant date fair value (in dollars per share) | $ / shares	$ 33.55
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	44.26
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	32.93
Canceled or expired, weighted average grant date fair value (in dollars per share) | $ / shares	41.92
Outstanding - end of year, weighted average grant date fair value (in dollars per share) | $ / shares	$ 36.61
Performance-Based
Number of Shares
Outstanding - beginning of year, number of shares | shares	28,000
Granted, number of shares | shares	120,000
Vested, number of shares | shares	(14,000)
Canceled or expired, number of shares | shares	(14,000)
Outstanding - end of year, number of shares | shares	120,000
Weighted Average Grant Date Fair Value
Outstanding - beginning of year, weighted average grant date fair value (in dollars per share) | $ / shares	$ 20.30
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	48.72
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	20.30
Canceled or expired, weighted average grant date fair value (in dollars per share) | $ / shares	20.30
Outstanding - end of year, weighted average grant date fair value (in dollars per share) | $ / shares	$ 48.72