Stockholder's Equity (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income Loss [Line Items]
Unrecognized losses on cash flow hedges	$ (6,486)	$ (6,957)	$ (8,283)	$ (8,561)
Unrecognized losses on equity investments	(44)	(216)	(611)	(619)
Unrecognized gains (losses) on foreign currency translation	(23,587)	(881)	0	0
Unrecognized actuarial losses	(2,974)	(2,974)	(2,748)	(2,748)
Totals	(33,091)	(11,028)	(11,642)	(11,928)
Other comprehensive income before reclassification adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Unrecognized losses on cash flow hedges	946		739
Unrecognized losses on equity investments	172		8
Unrecognized gains (losses) on foreign currency translation	(22,706)		0
Unrecognized actuarial losses	0		0
Totals	(21,588)		747
Reclassification amount to net income
Accumulated Other Comprehensive Income Loss [Line Items]
Unrecognized losses on cash flow hedges	(475)		(461)
Unrecognized losses on equity investments	0		0
Unrecognized gains (losses) on foreign currency translation	0		0
Unrecognized actuarial losses	0		0
Totals	(475)		(461)
Net current period other comprehensive income
Accumulated Other Comprehensive Income Loss [Line Items]
Unrecognized losses on cash flow hedges	471		278
Unrecognized losses on equity investments	172		8
Unrecognized gains (losses) on foreign currency translation	(22,706)		0
Unrecognized actuarial losses	0		0
Totals	$ (22,063)		$ 286