Risk Management and Derivatives (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivative financial instruments on consolidated balance sheets
Derivative Assets, Fair Value	$ 2,471	$ 0
Derivative Liabilities, Fair Value	2,043	3,435
Foreign exchange contracts
Derivative financial instruments on consolidated balance sheets
Derivative Assets, Fair Value	1,991	0
Derivative Liabilities, Fair Value	2,043	2,855
Cash flow interest rate swap
Derivative financial instruments on consolidated balance sheets
Derivative Assets, Fair Value	480	0
Derivative Liabilities, Fair Value	$ 0	$ 580