Compensation Plans-Various Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 5,000,000	$ 2,500,000	$ 1,800,000
Intrinsic value of option exercises on date of exercise	300,000	327,000	132,000
Cash received from the exercise of stock options	2,040,000	1,291,000	889,000
Restricted stock units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,142,000	658,000	555,000
Total fair value at vesting date	828,000	660,000	331,000
Total unrecognized compensation cost for nonvested stock units	2,168,000	1,256,000	273,000
Expected years to recognize unearned compensation	3 years 7 months	4 years	10 months 24 days
Stock options and stock-settled stock appreciation rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 213,000	$ 478,000	$ 911,000