Derivative Instruments (Interest Rate Derivatives) (Details)				6 Months Ended
	Jun. 30, 2014 USD ($)		Dec. 31, 2013 JPY (¥)	Jun. 30, 2014 Swap 3 [Member] USD ($)		Jun. 30, 2014 Swap 3 [Member] JPY (¥)
Derivative [Line Items]
Effective Date				Mar. 15, 2009		Mar. 15, 2009
Termination Date				Sep. 15, 2020		Sep. 15, 2020
Derivatives, current notional amount	$ 46,482,000	[1]	¥ 3,300,000,000	$ 46,482,000	[1]
Swap Rate (in thousandths)				2.065%		2.065%
Type				Variable-to-Fixed		Variable-to-Fixed
Exchange rate			102.53			101.33

[1] Notional amount converted from Yen at June 30, 2014 at a Yen to USD exchange rate of 101.33.