Common Stock (Details Textual) - USD ($)			12 Months Ended
	Oct. 03, 2014	Sep. 29, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 02, 2014	Dec. 31, 2013	Dec. 31, 2009
Common Stock [Line Items]
Common stock, shares outstanding			16,740,587
Repurchases of common stock in the open market			$ 7,959,000	$ 12,347,000	$ 66,640,000
Shares sold in private placement								2,857,143
Common stock, par value (in dollars per share)			$ 0.01	$ 0.01				$ 0.01
Securities purchase agreement purchase price								$ 20,000,000
Beneficial ownership maximum percentage								23.00%
Purchase price percentage							1.00%
Shareholders indemnification amount							$ 25,000
Sagard [Member]
Common Stock [Line Items]
Share price (in dollars per share)								$ 7.00
Stock beneficially owned			3,639,367
Stock beneficial ownership percentage			21.70%
Maximum [Member]
Common Stock [Line Items]
Liquidated damages amount							$ 2,400,000
Stock Repurchase Program [Member]
Common Stock [Line Items]
Stock repurchased during period (shares)			340,000	477,000	147,000
Repurchases of common stock in the open market			$ 8,000,000	$ 12,300,000	$ 3,700,000
Remaining authorized repurchase amount			$ 6,100,000
Modified Dutch Auction Tender Offer [Member]
Common Stock [Line Items]
Stock repurchased during period (shares)	2,127,706
Stock repurchase program authorized amount						$ 80,000,000
Treasury stock acquired average cost per share		$ 29.00
Payments for repurchase of equity	$ 61,700,000
Tender offer expenses	$ 1,200,000
Percentage of outstanding shares repurchased		11.10%
Modified Dutch Auction Tender Offer [Member] | Maximum [Member]
Common Stock [Line Items]
Authorized per share range (in dollars per share)						$ 29.00
Modified Dutch Auction Tender Offer [Member] | Minimum [Member]
Common Stock [Line Items]
Authorized per share range (in dollars per share)						$ 26.00
Equity Compensation Award [Member]
Common Stock [Line Items]
Shares reserved for future issuance			398,960
2011 Plan [Member]
Common Stock [Line Items]
Shares reserved for future issuance			729,095