Stockholders Equity and Equity Compensation Plans (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Mar. 12, 2014	Mar. 31, 2014	Mar. 31, 2013
Stockholders Equity and Equity Compensation Plans (Additional Textual) [Abstract]
Shares repurchased			0.3
Total amount paid			$ 6.5
Weighted-average price per share			$ 19.80
Remaining number of shares available for repurchase		2.1
Repurchase of common stock for employee tax withholdings, shares		0.2	0.2
Repurchase of common stock for tax withholdings, value		6.5	4.8
Cash dividends declared per common share		$ 0.15
Cash dividend	5.1
Shareholders of Record Date		Mar. 12, 2014
Dividend payment date		Mar. 27, 2014
Stock-based compensation expense		3.8	3.6
Performance Shares
Stockholders Equity and Equity Compensation Plans (Additional Textual) [Abstract]
Performance based awards granted to executive management shares		0.1
Stockholders' Equity and Equity Compensation Plans (Textual) [Abstract]
Common stock shares issued to members of executive management vesting installments		3 years
Restricted common stock
Stockholders' Equity and Equity Compensation Plans (Textual) [Abstract]
Common stock shares issued to members of executive management vesting installments		4 years
Cash Dividend Paid
Stockholders Equity and Equity Compensation Plans (Additional Textual) [Abstract]
Payment of cash dividends		4.9
Vested Shares
Stockholders Equity and Equity Compensation Plans (Additional Textual) [Abstract]
Payment of cash dividends		$ 0.3