Shareholder Rights Plan (Details) (USD $)	0 Months Ended			0 Months Ended
	Jul. 08, 2009	Dec. 31, 2013	Dec. 31, 2012	Feb. 06, 2012 Schuler stockholders	Feb. 06, 2012 Schuler stockholders Maximum
Shareholder Rights Plan
Number of preferred stock purchase rights distributed as dividend per common stock share (in shares)	1
Minimum percentage of outstanding common stock to be acquired for rights to be exercisable	15.00%
Minimum percentage of common stock to be acquired in a tender or exchange offer for rights to be exercisable	15.00%
Shareholder rights plan
Maximum number of shares beneficially owned by Schuler Stockholders		34,581,449	34,306,570		5,091,295
Percentage of the company's outstanding common stock deemed to be owned by Schuler Stockholders					14.70%
Common stock, par value per share (in dollars per share)		$ 0.01	$ 0.01	$ 0.01
Percentage of outstanding common stock up to which Schuler Stockholders are allowed to increase their beneficial ownership without becoming Acquiring Persons				19.99%
Aggregate percentage of outstanding shares of common stock which beneficial owner, affiliates, and associates of beneficial owner can own less than without triggering exercise of rights				20.00%