Income Taxes - Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Operating Loss Carryforwards [Line Items]
Cost of Goods and Services Sold	$ 618,508,000	$ 511,387,000	$ 1,176,685,000	$ 982,977,000
Effective income tax rate continuing operations			31.50%	31.50%
Federal statutory tax rate			35.00%
Unrecognized Tax Benefits, Probability Threshold of Realizing for Tax Benefits Recognition, Minimum Percentage			50.00%
Unrecognized Tax Benefits, Including Foreign Tax Credits and Penalties and Interest	$ 6,300,000		$ 6,300,000